How to Install & configure Zimbra Open Source Mail Server on CentOS & RHEL

<div dir="ltr" style="text-align: left;" trbidi="on"> <span style="color: red; font-size: x-large;"><b><u><i>Install & configure Zimbra Open Source Mail Server on CentOS & RHEL</i></u></b></span><br /> <div> <span style="background-color: white; color: #222222; font-family: "open sans"; font-size: 17px; line-height: 31px;">Zimbra  is a Free Email Server and Calendar & collaboration solution, built for the both  public and private cloud . It is also considered an Exchange replacement. Zimbra provides a web GUI from where mailserver admin can manage zimbra server. Zimbra provides end users with a feature-rich browser-based experience that enables them to seamlessly and securely connect to their emails on any device or platform.</span></div> <div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> In this tutorial we will install & configure open source zimbra server on CentOS 6.X / RHEL 6.X. Before installating zimbra sever following prerequisite should be completed.</div> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #0b5394;">1. Create MX record for your domain<br style="box-sizing: border-box;" />2. Create A record for your’s Hostname</span></div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> In my case domain is “hackthesec.co.in” & Server’s Hostname is “zimbra.hackthesec.co.in”</div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <strong style="box-sizing: border-box;">Step:1</strong> Install Necessary  Packages & update hosts file</div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;"><span style="color: #222222;"># # yum -y </span><span style="color: #783f04;">install nc wget nano make nc sudo sysstat</span><span style="color: #222222;"> libtool-ltdl glibc perl ntp</span></pre> <div> <br /></div> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: red;">Edit the file /etc/hosts</span></div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="box-sizing: border-box; color: navy;">x.x.x.x zimbra.hackthesec.co.in</span></div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <strong style="box-sizing: border-box;">Step:2</strong> Stop Sendmail & postfix service if started & Disabled Selinux</div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <strong style="box-sizing: border-box;"></strong></div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; color: #222222; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;"># chkconfig sendmail off ; service sendmail stop ; chkconfig postfix off ; service  postfix stop ;</pre> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #222222;">Disable selinux  in the file </span><span style="box-sizing: border-box;"><span style="color: red;">/etc/selinux/config</span></span><span style="color: #222222;"> change the selinux= line to </span><span style="box-sizing: border-box;"><span style="color: red;">SELINUX=disabled </span></span></div> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #0b5394;"><strong style="box-sizing: border-box;">Step:3</strong> Download the Zimbra Server using below command</span></div> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #0b5394;"><strong style="box-sizing: border-box;"></strong></span></div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; color: #222222; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;"># wget http://files2.zimbra.com/downloads/8.0.4_GA/zcs-8.0.4_GA_5737.RHEL6_64.20130524120036.tgz</pre> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #0b5394;"><strong style="box-sizing: border-box;"><br /></strong></span></div> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #0b5394;"><strong style="box-sizing: border-box;">Step:4 </strong>Now extract Zimbra tar file using below command</span></div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;"><span style="color: #222222;"># </span><span style="color: #783f04;">tar -zxpvf </span><span style="color: #222222;">zcs-8.0.4_GA_5737.RHEL6_64.20130524120036.tgz</span></pre> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <strong style="box-sizing: border-box;"><br /></strong></div> <div style="background-color: white; box-sizing: border-box; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <span style="color: #0b5394;"><strong style="box-sizing: border-box;">Step:5 </strong>Now Change the directory & run below command to install zimbra</span></div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;"><span style="color: #222222;"># cd zcs-8.0.4_GA_5737.RHEL6_64.20130524120036 # </span><span style="color: #20124d;">./install.sh  --platform-override</span></pre> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> We are using ‘<strong style="box-sizing: border-box;">–platform-override</strong>‘ option in above command because installation script is only for Redhat  Linux but we are installing on CentOS 6.X machine so to override the Platform condition we are using this option. When we execute the above command we will get below output and follow the instructions :</div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; color: #222222; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;">Operations logged to /tmp/install.log.2570 Checking for existing installation... zimbra-ldap...NOT FOUND zimbra-logger...NOT FOUND zimbra-mta...NOT FOUND zimbra-snmp...NOT FOUND zimbra-store...NOT FOUND zimbra-apache...NOT FOUND zimbra-spell...NOT FOUND zimbra-convertd...NOT FOUND zimbra-memcached...NOT FOUND zimbra-proxy...NOT FOUND zimbra-archiving...NOT FOUND zimbra-cluster...NOT FOUND zimbra-core...NOT FOUND PLEASE READ THIS AGREEMENT CAREFULLY BEFORE USING THE SOFTWARE. ZIMBRA, INC.. License Terms for the Zimbra Collaboration Suite: http://www.zimbra.com/license/zimbra_public_eula_2.1.html Do you agree with the terms of the software license agreement? [N] Y Do you agree with the terms of the software license agreement? [N] Y License Terms for the Zimbra Collaboration Suite: http://www.zimbra.com/license/zimbra_public_eula_2.1.html Do you agree with the terms of the software license agreement? [N] Y Do you agree with the terms of the software license agreement? [N] Y Checking for prerequisites... FOUND: NPTL FOUND: nc-1.84-22 FOUND: sudo-1.8.6p3-12 FOUND: libidn-1.18-2 FOUND: gmp-4.3.1-7 FOUND: /usr/lib64/libstdc++.so.6 Checking for suggested prerequisites... FOUND: perl-5.10.1 FOUND: sysstat FOUND: sqlite Prerequisite check complete. Checking for installable packages Found zimbra-core Found zimbra-ldap Found zimbra-logger Found zimbra-mta Found zimbra-snmp Found zimbra-store Found zimbra-apache Found zimbra-spell Found zimbra-memcached Found zimbra-proxy Select the packages to install Install zimbra-ldap [Y] Y Install zimbra-logger [Y] Y Install zimbra-mta [Y] Y Install zimbra-snmp [Y] Y Install zimbra-store [Y] Y Install zimbra-apache [Y] Y Install zimbra-spell [Y] Y Install zimbra-memcached [N] Y Install zimbra-proxy [N] Y Checking required space for zimbra-core Checking space for zimbra-store Installing: zimbra-core zimbra-ldap zimbra-logger zimbra-mta zimbra-snmp zimbra-store zimbra-apache zimbra-spell zimbra-memcached zimbra-proxy The system will be modified.  Continue? [N] Y Removing /opt/zimbra Removing zimbra crontab entry...done. Cleaning up zimbra init scripts...done. Cleaning up /etc/ld.so.conf...done. Cleaning up /etc/security/limits.conf...done. Finished removing Zimbra Collaboration Server. Installing packages zimbra-core......zimbra-core-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-ldap......zimbra-ldap-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-logger......zimbra-logger-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-mta......zimbra-mta-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-snmp......zimbra-snmp-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-store......zimbra-store-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-apache......zimbra-apache-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-spell......zimbra-spell-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-memcached......zimbra-memcached-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done zimbra-proxy......zimbra-proxy-8.0.4_GA_5737.RHEL6_64-20130524120036.x86_64.rpm...done Operations logged to /tmp/zmsetup.12152013-081656.log Installing LDAP configuration database...done. Setting defaults... DNS ERROR resolving MX for zimbra.hackthesec.co.in It is suggested that the domain name have an MX record configured in DNS Change domain name? [Yes] Yes Create domain: [zimbra.hackthesec.co.in] hackthesec.co.in.com                                            MX: zimbra.hackthesec.co.in (162.13.151.48) Interface: 162.13.151.48 Interface: 2a00:1a48:7807:102:c7d4:45f6:ff08:2209 Interface: 10.181.72.68 Interface: 127.0.0.1 Interface: ::1 done.</pre> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <strong style="box-sizing: border-box;">Step:6</strong> Next you will come to the Main Menu which will show your configuration. Select #3 then change the Admin Password under option #4 next hit r to go back.</div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; color: #222222; font-family: monospace, monospace; font-size: 17px; line-height: 31px; margin-top: 24px; overflow: auto; padding: 4px 10px;">*** CONFIGURATION COMPLETE - press 'a' to apply Select from menu, or press 'a' to apply config (? - help) a Save configuration data to a file? [Yes] Yes Save config in file: [/opt/zimbra/config.10975] Saving config in /opt/zimbra/config.10975...done. The system will be modified - continue? [No] Yes Operations logged to /tmp/zmsetup.12152013-081656.log Setting local config values...</pre> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> When Configuration complete – press return to exit. Now the zimbra installation is completed.</div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <strong style="box-sizing: border-box;">Step:7 </strong>Access web administration console</div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> Use the URL ‘<span style="box-sizing: border-box; color: navy;">https://<Server’s HostName>:7071′</span></div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> In my case URL is “https://zimbra.hackthesec.co.in:7071”</div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> Use the User Name as admin and Password that we have set while installation in the above steps.</div> <div class="separator" style="clear: both; text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Z6KUHaYWeXQFyG6YvYFqoR8TxIHBXyznC-xYB21cPSbtkm__Vqpt3gI6xqm46NomSYAgE0wLCg79B7b_im0isFjOOqVbgYtSh_MIeg3s-uciNeHe4tfhQ5-rQyFdS_Zo0E0mBkF_XtUx/s1600/zimbra-admin-console_www.hackthesec.co.in.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1Z6KUHaYWeXQFyG6YvYFqoR8TxIHBXyznC-xYB21cPSbtkm__Vqpt3gI6xqm46NomSYAgE0wLCg79B7b_im0isFjOOqVbgYtSh_MIeg3s-uciNeHe4tfhQ5-rQyFdS_Zo0E0mBkF_XtUx/s1600/zimbra-admin-console_www.hackthesec.co.in.jpg" /></a></div> <div style="background-color: white; box-sizing: border-box; color: #222222; font-family: 'Open Sans'; font-size: 17px; line-height: 31px; margin-bottom: 26px;"> <br /> <div style="box-sizing: border-box; font-family: 'Open Sans'; margin-bottom: 26px;"> <strong style="box-sizing: border-box;">Note</strong> : Use zmcontrol Command to  stop, start & to check Status of zimbra Server</div> <pre style="background-color: #f1f1f1; border-radius: 0px; border: none; box-sizing: border-box; font-family: monospace, monospace; margin-top: 24px; overflow: auto; padding: 4px 10px;">[root@zimbra ~]# su - zimbra [zimbra@zimbra ~]$ zmcontrol status [zimbra@zimbra ~]$ zmcontrol stop [zimbra@zimbra ~]$ zmcontrol start</pre> <a href="http://www.hackthesec.co.in/" target="_blank">www.hackthesec.co.in</a><br /> <a href="https://www.twitter.com/hackthesecurity" target="_blank">Hack The Sec Twitter</a></div> </div> </div>

How to Install & configure Zimbra Open Source Mail Server on CentOS & RHEL

Install & configure Zimbra Open Source Mail Server on CentOS & RHEL Zimbra  is a Free Email Server and Calendar & collaborati...

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How to setup mail server on centos 7

<div dir="ltr" style="text-align: left;" trbidi="on"> <h1 style="background-color: white; clear: both; font-stretch: normal; height: auto; margin: 0px; padding: 0px; text-align: center; width: 614px;"> <span style="color: #990000; font-family: Trebuchet, Trebuchet MS, Arial, Verdana, sans-serif; font-size: large;"><span style="line-height: 30px;"><u>Setup mail server on centos 7</u></span></span></h1> <h1 style="background-color: white; clear: both; color: #333333; font-family: Trebuchet, 'Trebuchet MS', Arial, Verdana, sans-serif; font-size: 30px; font-stretch: normal; font-weight: normal; height: auto; line-height: 31px; margin: 0px; padding: 0px; text-align: left; width: 614px;"> <span style="color: #222222; font-size: 16px; line-height: 30px;">This article helps you to install and configure basic mail server on </span><a href="http://www.hackthesec.co.in/search/label/Centos" style="color: #0f4884; font-size: 16px; line-height: 30px; text-decoration: none;" title="Centos">Centos</a><span style="color: #222222; font-size: 16px; line-height: 30px;"> 7. Here i have used Postfix for SMTP, Dovecot for POP/IMAP and Dovecot SASL for SMTP AUTH.</span></h1> <div style="background-color: white; color: #333333; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 19.2px;"> <span style="color: #222222; font-family: trebuchet, 'trebuchet ms', arial, verdana, sans-serif; font-size: 16px; line-height: 30px;">Before proceeding please make sure you have assigned static IP for the server and have internet connectivity for installing packages.</span></div> <div style="background-color: white; color: #333333; font-family: Verdana, Geneva, sans-serif; font-size: 12px; line-height: 19.2px;">                                 <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwXFjlAbKP-BbS_imp_3im9swmB_1h-YvwnJ9adp3dLHRZ8SnhttbxG5pHeSzoLgYS1-xSDzZRkhdzDCgkfeg1k4YK4AC19sZy8_R90QH-NNjOMo2IOvktIgpRdZ1fbp2Ti2SOaCOvx5mV/s1600/mailserver-with-virtual-users-and-domains-using-postfix-and-dovecot-in-centos-6+_www.hackthesec.co.in.png" imageanchor="1"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwXFjlAbKP-BbS_imp_3im9swmB_1h-YvwnJ9adp3dLHRZ8SnhttbxG5pHeSzoLgYS1-xSDzZRkhdzDCgkfeg1k4YK4AC19sZy8_R90QH-NNjOMo2IOvktIgpRdZ1fbp2Ti2SOaCOvx5mV/s1600/mailserver-with-virtual-users-and-domains-using-postfix-and-dovecot-in-centos-6+_www.hackthesec.co.in.png" /></a></div> <div style="background-color: white;"> <div> <span style="color: #0b5394; font-family: trebuchet, trebuchet ms, arial, verdana, sans-serif; font-size: large;"><span style="line-height: 30px;"><b><u>Setup mail server on centos 7</u></b></span></span></div> <div> <span style="color: #222222; font-family: Georgia, Times New Roman, serif; font-size: large;"><span style="line-height: 30px;">1. Installing packages</span></span></div> <div> <span style="color: #222222; font-family: trebuchet, trebuchet ms, arial, verdana, sans-serif; font-size: large;"><span style="line-height: 30px;">2. Postfix configuration</span></span></div> <div> <span style="color: #222222; font-family: trebuchet, trebuchet ms, arial, verdana, sans-serif; font-size: large;"><span style="line-height: 30px;">3. Dovecot configuration</span></span></div> <div> <span style="color: #222222; font-family: trebuchet, trebuchet ms, arial, verdana, sans-serif; font-size: large;"><span style="line-height: 30px;">4. User creation</span></span></div> <div> <div style="font-family: trebuchet, 'trebuchet ms', arial, verdana, sans-serif; line-height: 30px;"> <b><u><span style="color: #0b5394; font-size: large;">Step 1: Installing packages</span></u></b></div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 1 : Assign hostname for the server using the below command</span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">.</span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">[root@hackthesec~]# hostnamectl set-hostname mail.hackthesec.co.in</span></span><span style="color: #222222; font-family: trebuchet, trebuchet ms, arial, verdana, sans-serif;"><span style="line-height: 30px; white-space: normal;"> </span></span></pre> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 2 : Make a host entry with your IP in </span><span style="color: #990000;"><b>/etc/hosts</b> </span><span style="color: #222222;">file.</span></span></span></div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">172.27.0.51 mail.hackthesec.co.in</span></span></pre> </div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 3 : Now start installing packages.</span></span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;">[root@hackthesec~]# yum -y </span><span style="color: lime;">install postfix dovecot</span></span></span></pre> </div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">After package installation continue with postfix configuration.</span></span></div> <div> <span style="color: #0b5394; font-family: trebuchet, trebuchet ms, arial, verdana, sans-serif; font-size: large;"><span style="line-height: 30px;"><b><u>Step 2 : Postfix configuration</u></b></span></span></div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">First create SSL certificate for encryption.</span></span></div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 4: Follow the below steps one by one for creation</span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">.</span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">[root@hackthesec ~]# mkdir /etc/postfix/ssl [root@</span></span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;">hackthesec</span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;"> ~]# cd /etc/postfix/ssl</span> <span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">[root@</span></span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;">hackthesec</span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;"> ssl]# openssl genrsa -des3 -out server.key 2048</span> <span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">[root@</span></span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;">hackthesec</span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;"> ssl]# openssl rsa -in server.key -out server.key.insecure</span> <span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">[root@</span></span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;">hackthesec</span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;"> ssl]# mv server.key server.key.secure</span> <span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">[root@</span></span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;">hackthesec</span><span style="color: white; font-family: 'Trebuchet MS', sans-serif; font-size: medium; line-height: 15.6px;"> ssl]# mv server.key.insecure server.key</span></pre> </div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Leave blank for </span><b><span style="color: #990000;">A challenge password []</span></b><span style="color: #222222;"> value in the below step.</span></span></span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;">[root@hackthesec ssl]# openssl req -new -key </span><span style="color: lime;">server.key -out server.csr</span><span style="color: white;"> [root@hackthesec ssl]# openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt</span></span></span></pre> </div> <div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 5 : Now open</span><span style="color: #990000;"><b> /etc/postfix/main.cf</b></span><span style="color: #222222;"> file for changes.</span></span></span></div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Find and uncomment the below lines</span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">.</span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: white; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">#inet_interfaces = localhost #---> line no 116 #mydestination = $myhostname, localhost.$mydomain, localhost #--> line no 164</span></span></pre> </div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">and add below lines at the end of the file. change <b>myhostname </b>and <b>mydomain </b>values with yours and <b>home_mailbox</b> value to your desired directory. Here it will store mails in the users home directory (Eg: /home/john/mail ).</span></span></div> <div> <pre class="xtypo_info" style="background: url("assets/shadow.png") 50% 100% repeat-x rgb(245, 245, 245); border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-shadow: rgb(204, 204, 204) 0px 0px 3px; box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; font-stretch: normal; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; tab-size: 4; text-shadow: rgb(255, 255, 255) 0px 1px 0px; white-space: pre-wrap; word-break: break-all; word-wrap: break-word;">myhostname = mail.hackthesec.co.in mydomain = hackthesec.co.in myorigin = $mydomain home_mailbox = mail/ mynetworks = 127.0.0.0/8 inet_interfaces = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_local_domain = smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_sasl_auth_enable = yes smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtp_tls_security_level = may smtpd_tls_security_level = may smtp_tls_note_starttls_offer = yes smtpd_tls_loglevel = 1 smtpd_tls_key_file = /etc/postfix/ssl/server.key smtpd_tls_cert_file = /etc/postfix/ssl/server.crt smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom</pre> </div> <div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 6 : Open </span><b><span style="color: #990000;">/etc/postfix/master.cf</span></b><span style="color: #222222;"> file, add the below lines after "</span><span style="color: #990000;">smtp inet n – n – – smtpd</span><span style="color: #222222;">" line</span></span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif; font-size: 15px; line-height: 26px;">.</span></div> <div style="color: #222222; font-family: trebuchet, 'trebuchet ms', arial, verdana, sans-serif; line-height: 30px;"> <pre class="xtypo_info" style="background: url("assets/shadow.png") 50% 100% repeat-x rgb(245, 245, 245); border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-shadow: rgb(204, 204, 204) 0px 0px 3px; box-sizing: border-box; color: #333333; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 13px; font-stretch: normal; line-height: 1.42857; margin-bottom: 10px; overflow: auto; padding: 9.5px; tab-size: 4; text-shadow: rgb(255, 255, 255) 0px 1px 0px; white-space: pre-wrap; word-break: break-all; word-wrap: break-word;">submission inet n - n - - smtpd -o syslog_name=postfix/submission -o smtpd_sasl_auth_enable=yes -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject -o milter_macro_daemon_name=ORIGINATING smtps inet n - n - - smtpd -o syslog_name=postfix/smtps -o smtpd_sasl_auth_enable=yes -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject -o milter_macro_daemon_name=ORIGINATING Now check the configuration using postfix check command. Step 7 : Now configure Dovecot SASL for SMTP Auth. Open /etc/dovecot/conf.d/10-master.conf file, find “# Postfix smtp-auth” line ( line no:95 ) and add the below lines. # Postfix smtp-auth unix_listener /var/spool/postfix/private/auth {mode = 0660 user = postfix group = postfix }</pre> </div> </div> <div style="font-family: trebuchet, 'trebuchet ms', arial, verdana, sans-serif; line-height: 30px;"> <div style="font-family: 'Times New Roman'; line-height: normal;"> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Now check the configuration using <b><span style="color: #990000;">postfix check</span></b> command.</span></span></div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 7 : Now configure Dovecot SASL for SMTP Auth. Open <b><span style="color: #990000;">/etc/dovecot/conf.d/10-master.conf</span></b> file, find "<b><span style="color: #990000;"># Postfix smtp-auth</span></b>" line ( line no:95 ) and add the below lines.</span></span></div> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;"># Postfix smtp-auth </span><span style="color: lime;">unix_listener /var/spool/postfix/private/auth {mode = 0660 </span><span style="color: white;">user = postfix group = postfix }</span></span></span></pre> </div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 8 : Open </span><b><span style="color: #990000;">/etc/dovecot/conf.d/10-auth.conf</span></b><span style="color: #222222;"> file, find "<b>auth_mechanisms = plain</b>" ( Line no: 100 ) and add login to the value like below.</span></span></span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: lime;">auth_mechanisms</span><span style="color: white;"> = plain login</span></span></span></pre> </div> <div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 9 : Postfix configuration is over. Now restart both postfix and dovecot services and enable auto start</span></span><span style="color: #222222; font-family: Verdana, Geneva, sans-serif; line-height: normal;"><span style="font-size: 15px; line-height: 26px;">.</span></span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: orange;">[root@mail ~]# systemctl restart postfix </span><span style="color: white;">[root@mail ~]# systemctl enable postfix </span><span style="color: lime;">[root@mail ~]# systemctl restart dovecot </span><span style="color: orange;">[root@mail ~]# systemctl enable dovecot</span></span></span></pre> </div> <div> <div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 10 : Add the firewall rules to allow <b>25, 587 and 465</b> ports</span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;">[root@mail ~]# firewall-cmd --permanent --add-service=smtp </span><span style="color: lime;">[root@mail ~]# firewall-cmd --permanent --add-port=587/tcp </span><span style="color: white;">[root@mail ~]# firewall-cmd --permanent --add-port=465/tcp </span><span style="color: orange;">[root@mail ~]# firewall-cmd --reload</span></span></span></pre> </div> <div> <div> <div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Now start testing connectivity for each ports 25,587 and 465 using telnet and make sure you are getting </span><span style="color: #990000;"><b>AUTH PLAIN LOGIN</b></span><span style="color: #222222;"> line after issuing <b>ehlo mail.hackthesec.co.in </b>command in telnet</span></span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;">[root@mail ~]# </span><span style="color: lime;">telnet mail.hackthesec.co.in 465</span><span style="color: white;"> Trying 172.27.0.51... Connected to mail.hackthesec.co.in. Escape character is '^]'. </span><span style="color: orange;">220 mail.hackthesec.co.in ESMTP Postfix </span><span style="color: white;">ehlo mail.hackthesec.co.in</span></span></span></pre> </div> <div> <div> <div> <div> <div> <span style="color: #0b5394; font-family: Verdana, Geneva, sans-serif; font-size: large;"><span style="line-height: 26px;"><b><u>Step 3 : Dovecot configuration</u></b></span></span></div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Start configuring Dovecot</span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 11 : Open </span><b><span style="color: #990000;">/etc/dovecot/conf.d/10-mail.conf</span></b><span style="color: #222222;"> file, find <b>#mail_location =</b> (line no : 30 ) and add the same directory which is given to home_mailbox in the postfix config file ( Step 5)</span></span></span><span style="font-size: 15px; line-height: 26px;">.</span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;">mail_location = </span><span style="color: lime;">maildir:~/mail</span></span></span></pre> </div> <div> <div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 12 : Open </span><b><span style="color: #990000;">/etc/dovecot/conf.d/20-pop3.conf</span></b><span style="color: #222222;"> file, find and uncomment the below line ( line no : 50 )</span></span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> </div> </div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="color: lime; font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;">pop3_uidl_format = %08Xu%08Xv</span></span></pre> </div> <div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 13 : Restart dovecot service</span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: white;">[root@mail ~]# </span><span style="color: lime;">systemctl restart dovecot</span></span></span></pre> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Step 14 : Add firewall rules to allow 110,143,993 and 995</span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: lime;">[root@mail ~]# firewall-cmd --permanent --add-port=110/tcp </span><span style="color: white;">[root@mail ~]# firewall-cmd --permanent --add-service=pop3s </span><span style="color: orange;">[root@mail ~]# firewall-cmd --permanent --add-port=143/tcp </span><span style="color: white;">[root@mail ~]# firewall-cmd --permanent --add-service=imaps [root@mail ~]# firewall-cmd --reload</span></span></span></pre> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> <div> </div> </div> </div> <div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Check the connectivity for the ports 110,143,993 and 995 using telnet</span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div> <span style="color: #0b5394; font-family: Verdana, Geneva, sans-serif; font-size: large;"><span style="line-height: 26px;"><b><u>Step 4 : User creation</u></b></span></span></div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Now create user for testing .</span></span></div> <div> <span style="font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;"><span style="color: #222222;">Step 15 : Create user with </span><b><span style="color: #990000;">/sbin/nologin</span></b><span style="color: #222222;"> shell to restrict login access</span></span></span><span style="font-size: 15px; line-height: 26px;">.</span></div> <div> <pre style="background-attachment: scroll; background-clip: initial; background-color: #3c3c3c; background-image: none; background-origin: initial; background-position: 0px 0px; background-repeat: repeat; background-size: initial; border-image-outset: initial; border-image-repeat: initial; border-image-slice: initial; border-image-source: initial; border-image-width: initial; border-radius: 4px; border: 1px solid rgb(229, 229, 229); margin-bottom: 20px; outline: 0px; overflow: auto; padding: 20px; vertical-align: baseline;"><span style="font-family: Trebuchet MS, sans-serif; font-size: medium;"><span style="line-height: 15.6px;"><span style="color: lime;">[root@mail ~]# useradd -m john -s /sbin/nologin </span><span style="color: white;">[root@mail ~]# passwd hackthesec</span></span></span></pre> </div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div> <div> <span style="color: #222222; font-family: Verdana, Geneva, sans-serif;"><span style="font-size: 15px; line-height: 26px;">Mail server is ready now, Configure user in your mail client and test send/receive</span></span><span style="color: black; font-family: 'Times New Roman'; font-size: 15px; line-height: 26px;">.</span></div> <div style="color: black; font-family: 'Times New Roman'; line-height: normal;"> </div> </div> <div style="color: #222222; font-family: trebuchet, 'trebuchet ms', arial, verdana, sans-serif; line-height: 30px;"> <img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-KvSTpPDbIqW1IOfpC424M9kQxnYaFzCZG7wO9XNDKTPS6lEYN_6UsN5XZrRvlDCj2ypN4O0teETtY3z2W6_uQjDAuwDLbCahUN7hvCt4qktVwfYNjZWBzEYa5_4RNUY8qrkrzNCKQZm1/s640/Setup+mail+server+on+centos+7_www.hackthesec.co.in.png" /></div> <div style="color: #222222; font-family: trebuchet, 'trebuchet ms', arial, verdana, sans-serif; line-height: 30px;"> <a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div> </div> </div> </div>

How to setup mail server on centos 7

Setup mail server on centos 7 This article helps you to install and configure basic mail server on  Centos  7. Here i have used Postfix ...

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