install Postfix - Dovecot - Squirrelmail on CentOS 7

install Postfix - Dovecot - Squirrelmail on CentOS 7

Remove sendmail
# yum remove sendmail

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Install Postfix
# yum install postfix

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Configure Postfix
# vim /etc/postfix/main.cf

## find and set ##
myhostname = mail.your_domain_here.com
mydomain = your_domain_here.com
myorigin = $mydomain
inet_interfaces = all
inet_protocols = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 127.0.0.0/8
home_mailbox = Maildir/

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Setup auto start + Restart postfix
# systemctl enable postfix
# systemctl restart postfix

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Testing Postfix
# useradd test_mail
# passwd test_mail
# yum install telnet
# telnet localhost 25
      Trying ::1...
      Connected to localhost.
      Escape character is '^]'.
      220 mail.your_domain_here.com ESMTP Postfix
  ehlo localhost
      250-mail.your_domain_here.com
      250-PIPELINING
      250-SIZE 10240000
      250-VRFY
      250-ETRN
      250-ENHANCEDSTATUSCODES
      250-8BITMIME
      250 DSN
  mail from:<test_mail>
      250 2.1.0 Ok
  rcpt to:<test_mail>
      250 2.1.0 Ok
  data
      354 End data with <CR><LF>.<CR><LF>
  Hello! This is test mail.
  .
      250 2.0.0 Ok: queued as 9AC752110D
  quit
      221 2.0.0 Bye
      Connection closed by foreign host.

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Check your created mail
# cd /home/test_mail/Maildir/new/

To see mail's content
# cat 1460264935.Vfd00Ic4dd6M808471.mail.your_domain_here.com

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Install Dovecot
# yum install dovecot

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Config Dovecot

# vim /etc/dovecot/dovecot.conf
## Umcomment ##
protocols = imap pop3 lmtp

# vim /etc/dovecot/conf.d/10-mail.conf
## Uncomment ##
mail_location = maildir:~/Maildir

# vim /etc/dovecot/conf.d/10-auth.conf
## Uncomment ##
disable_plaintext_auth = yes
## add "login" ##
auth_mechanisms = plain login

# vim /etc/dovecot/conf.d/10-master.conf
## Find Postfix smtp-auth then edit ##
unix_listener /var/spool/postfix/private/auth {
  mode = 0600
  user = postfix
  group = postfix
}

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Setup auto start + Restart dovecot
# systemctl enable dovecot
# systemctl restart dovecot

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Testing Dovecot
# telnet localhost pop3
      Trying ::1...
      Connected to localhost.
      Escape character is '^]'.
      +OK Dovecot ready.
  user test_mail
      +OK
  pass your_test_mail_user_password
      +OK Logged in.
  retr 1
      +OK 447 octets
      Return-Path: <test_mail@your_domain_here.com>
      X-Original-To: test_mail
      Delivered-To: test_mail@your_domain_here.com
      Received: from localhost (localhost [IPv6:::1])
      by server.admivietnam.org (Postfix) with ESMTP id 9AC752110D
      for <test_mail>; Sun, 10 Apr 2016 12:07:49 +0700 (ICT)
      Message-Id: <[email protected]>
      Date: Sun, 10 Apr 2016 12:07:49 +0700 (ICT)
      From: test_mail@your_domain_here.com

      Hello! This is test mail.
      .
  quit
      +OK Logging out.
      Connection closed by foreign host.
      
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Install Squirrelmail
# yum install squirrelmail

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config Squirrelmail
# /usr/share/squirrelmail/config/conf.pl
[2] Server Settings
[1] Change your domain to: your_domain_here.com
[3] Change Sendmail to SMTP
[S] Save
[Q] Quit

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add Virtualhost for Squirrelmail in httpd.config (Apache)
# vim /etc/httpd/conf/httpd.conf

Alias /webmail /usr/share/squirrelmail
<Directory /usr/share/squirrelmail>
    Options Indexes FollowSymLinks
    RewriteEngine On
    AllowOverride All
    DirectoryIndex index.php
    Order allow,deny
    Allow from all
</Directory>

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Restart Apache
# systemctl restart httpd

And check
http://localhost/webmail
login by your Centos user and password
eg: test_mail, password: 123456