Before install postfix, remove sendmail from the server. Because sendmail is the default MTA in Redhat/CentOS.
[root@server ~]# yum remove sendmail
Prerequisites:
- The mail server should contain a valid MX record in the DNS server. Navigate to this link how to setup DNS server.
- Firewall and SELinux should be disabled.
[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=targeted
Reboot the server.
- The mail server should contain a valid MX record in the DNS server. Navigate to this link how to setup DNS server.
- Firewall and SELinux should be disabled.
[root@server ~]# service iptables stop
[root@server ~]# service ip6tables stop
[root@server ~]# chkconfig iptables off
[root@server ~]# chkconfig ip6tables off
Scenario
In this tutorial my test box
Hostname = server.ostechnix.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.ostechnix.com ##line no 75 - uncomment and enter your host name
mydomain = ostechnix.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:
250 2.1.5 Ok
data
354 End data with .
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.ostechnix.com
[root@server new]# cat 1360236956.Vfd00I35afM181256.server.ostechnix.com Return-Path:
X-Original-To: user1
Delivered-To: user1@ostechnix.com
Received: from localhost (localhost [IPv6:::1])
by server.ostechnix.com (Postfix) with ESMTP id 117113FF18
for ; Thu, 7 Feb 2013 17:05:32 +0530 (IST)
Message-Id: <20130207113547 .117113ff18="" server.ostechnix.com="">
Date: Thu, 7 Feb 2013 17:05:32 +0530 (IST)
From: user1@ostechnix.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:X-Original-To: user1 Delivered-To: user1@ostechnix.com Received: from localhost (localhost [IPv6:::1]) by server.ostechnix.com (Postfix) with ESMTP id 117113FF18 for ; Thu, 7 Feb 2013 17:05:32 +0530 (IST) Message-Id: <20130207113547 .117113ff18="" server.ostechnix.com=""> Date: Thu, 7 Feb 2013 17:05:32 +0530 (IST) From: user1@ostechnix.com To: undisclosed-recipients:; test . quit +OK Logging out. Connection closed by foreign host. [root@server ~]#
