Setup Mail Server using Postfix, Dovecot and SquirrelMail in CentOS/RHEL/ step by step
Before install postfix, remove sendmail from the server. Because sendmail is the default MTA in Redhat/CentOS.[root@server ~]# yum remove sendmail
Prerequisites:
[root@server ~]# service iptables stop [root@server ~]# service ip6tables stop [root@server ~]# chkconfig iptables off [root@server ~]# chkconfig ip6tables off
[root@server ~]# vi /etc/selinux/config # This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - No SELinux policy is loaded. SELINUX=disabled# SELINUXTYPE= can take one of these two values: # targeted - Targeted processes are protected, # mls - Multi Level Security protection. SELINUXTYPE=targetedReboot the server.
Scenario
In this tutorial my test box
Hostname = server.example.com
IP Address = 192.168.1.200/24
And my server is configured with proper MX record in DNS server.
Installation
Postfix is installed by default. If it is not installed, use the below command to install postfix.
[root@server ~]# yum install postfix
Configuration
Open the postfix config file /etc/postfix/main.cf. Find the below lines and edit them as shown below.
[root@server ~]# vi /etc/postfix/main.cf myhostname = server.example.com ##line no 75 - uncomment and enter your host name mydomain = example.com ##line no 83 - uncomment and enter your domain name myorigin = $mydomain ##line no 99 - uncomment inet_interfaces = all ##line no 116 - change to all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain ##line no 164 - add $domain at the end mynetworks = 192.168.1.0/24, 127.0.0.0/8 ##line no 264 - uncomment and add your network range home_mailbox = Maildir/ ##line no 419 - uncomment
Start the postfix service.
[root@server ~]# service postfix start Starting postfix: [ OK ] [root@server ~]# chkconfig postfix on
Test Postfix
The commands shown in bold letters should be entered by the user.
Note: The dot after the test command is important.
[root@server ~]# telnet localhost smtp Trying ::1... Connected to localhost. Escape character is '^]'. 220 server.ostechnix.com ESMTP Postfix ehlo localhost 250-server.ostechnix.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN mail from:<user1> 250 2.1.0 Ok rcpt to:<user1> 250 2.1.5 Ok data 354 End data with <CR><LF>.<CR><LF> test . 250 2.0.0 Ok: queued as 117113FF18 quit 221 2.0.0 Bye Connection closed by foreign host.
Check Mail
Navigate to the user mail directory and check for the new mail.
[root@server ~]# cd /home/user1/Maildir/new/[root@server new]# ls 1360236956.Vfd00I35afM181256.server.example.com [root@server new]# cat 1360236956.Vfd00I35afM181256.server.example.com Return-Path: <user1@example.com> X-Original-To: user1 Delivered-To: user1@example.com Received: from localhost (localhost [IPv6:::1]) by server.example.com (Postfix) with ESMTP id 117113FF18 for <user1>; Thu, 7 Feb 2013 17:05:32 +0530 (IST) Message-Id: <20130207113547.117113FF18@server.example.com> Date: Thu, 7 Feb 2013 17:05:32 +0530 (IST) From: user1@example.com To: undisclosed-recipients:; test
Thats it. Postfix working now.
Install Dovecot
[root@server ~]# yum install dovecot
Configure Dovecot
Open the dovecot config file /etc/dovecot/dovecot.conf. Find and uncomment the line as shown below.
[root@server ~]# vi /etc/dovecot/dovecot.conf protocols = imap pop3 lmtp
Open the file /etc/dovecot/conf.d/10-mail.conf and uncomment the line as shown below.
[root@server ~]# vi /etc/dovecot/conf.d/10-mail.conf
mail_location = maildir:~/Maildir ##line no 24 - uncomment
Open the /etc/dovecot/conf.d/10-auth.conf and edit as shown below.
[root@server ~]# vi /etc/dovecot/conf.d/10-auth.conf disable_plaintext_auth = no ##line no 9 - uncomment and change from yes to no. auth_mechanisms = plain login ##line no 97 - add the text "login"
Open the /etc/dovecot/conf.d/10-master.conf and edit as shown below.
unix_listener auth-userdb {
#mode = 0600
user = postfix ##line no 83 - uncomment and enter postfix
group = postfix ##line no 84 - uncomment and enter postfix
Start the dovecot service.
[root@server ~]# service dovecot start
Starting Dovecot Imap: [ OK ]
[root@server ~]# chkconfig dovecot on
Test Dovecot
The commands shown in bold should be entered by the user.
[root@server ~]# telnet localhost pop3 Trying ::1... Connected to localhost. Escape character is '^]'. +OK Dovecot ready. user user1 +OK pass user1 +OK Logged in. list +OK 1 messages: 1 428 . retr 1 +OK 428 octets Return-Path: <user1@example.com> X-Original-To: user1 Delivered-To: user1@example.com Received: from localhost (localhost [IPv6:::1]) by server.example.com (Postfix) with ESMTP id 117113FF18 for <user1>; Thu, 7 Feb 2013 17:05:32 +0530 (IST) Message-Id: <20130207113547.117113FF18@server.example.com> Date: Thu, 7 Feb 2013 17:05:32 +0530 (IST) From: user1@example.com To: undisclosed-recipients:; test . quit +OK Logging out. Connection closed by foreign host. [root@server ~]#
Dovecot is working now.
Install Squirrelmail
Install SquirrelMail package via yum.
[root@server ~]# yum install squirrelmail [root@server ~]# service httpd start Starting httpd: [ OK ] [root@server ~]# chkconfig httpd on [root@server ~]#
Configure Squirrelmail
Go to the squirrelmail config directory and use the command ./conf.pl to start configure as shown below.
[root@server ~]# cd /usr/share/squirrelmail/config/ [root@server config]# ./conf.pl SquirrelMail Configuration : Read: config.php (1.4.0) --------------------------------------------------------- Main Menu -- 1. Organization Preferences 2. Server Settings 3. Folder Defaults 4. General Options 5. Themes 6. Address Books 7. Message of the Day (MOTD) 8. Plugins 9. Database 10. Languages D. Set pre-defined settings for specific IMAP servers C Turn color off S Save data Q Quit Command >>1
Select option 1 and set organization details.
SquirrelMail Configuration : Read: config.php (1.4.0) --------------------------------------------------------- Organization Preferences 1. Organization Name : Example 2. Organization Logo : ../images/sm_logo.png 3. Org. Logo Width/Height : (308/111) 4. Organization Title : Welcome to Example webmail 5. Signout Page : 6. Top Frame : _top 7. Provider link : http://example.com 8. Provider name : Example R Return to Main Menu C Turn color off S Save data Q Quit Command >>R
Press R to return main menu and select option 2. Enter your domain name and select dovecot in the Sendmail or SMTP parameter.
SquirrelMail Configuration : Read: config.php (1.4.0) --------------------------------------------------------- Server Settings General ------- 1. Domain : ostechnix.com 2. Invert Time : false 3. Sendmail or SMTP : SMTP A. Update IMAP Settings : localhost:143 (uw) B. Update SMTP Settings : localhost:25 R Return to Main Menu C Turn color off S Save data Q Quit Command >> S
Once you done, press S to save datas and press Q to exit.
Add the following lines in the httpd.conf file at the end.
[root@server ~]# vi /etc/httpd/conf/httpd.conf Alias /squirrelmail /usr/share/squirrelmail <Directory /usr/share/squirrelmail> Options Indexes FollowSymLinks RewriteEngine On AllowOverride All DirectoryIndex index.php Order allow,deny Allow from all </Directory>
Restart the httpd service.
[root@server ~]# service httpd restart Stopping httpd: [ OK ] Starting httpd: [ OK ] [root@server ~]#
Create Users
[root@server ~]# useradd user1 [root@server ~]# useradd user2 [root@server ~]# passwd user1 [root@server ~]# passwd user2
Open the browser from any clients. Type the following in the address bar.
http://serveripaddress/webmail
or
http://yourdomainname/webmail
If you have any query then please leave a reply.
With Regards
Piyush Gupta
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