This article describes how to setup a mail server in centos 6 . Here i have used three popular packages which is very easy to configure .
» Postfix ( for sending )
» Dovecot ( for receiving )
» Squirrelmail ( for webmail access )
This guide is strictly for learning purpose , not for real time servers .
Let’s start
» Installing and configuring postfix
» Installing and configuring dovecot
» Installing and configuring squirrelmail
Step 1 »Before installation assign a static ip and add a host entry for your domain to that IP in the /etc/hosts file like below.192.168.0.15 krizna.com
Step 2 » Issue the below command to install postfix
[root@mail ~]# yum -y install postfix
Step 3 » Now issue the below command to install SMTP AUTH packages .
[root@mail ~]# yum -y install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi cyrus-sasl-md5 cyrus-sasl-plain
Postfix package installation is completed .
Step 4 » Issue the below commands one by one for creating SSL Cert.[root@mail ~]# mkdir /etc/postfix/ssl
[root@mail ~]# cd /etc/postfix/ssl/
[root@mail ssl]# openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024
[root@mail ssl]# chmod 600 smtpd.key
[root@mail ssl]# openssl req -new -key smtpd.key -out smtpd.csr
[root@mail ssl]# openssl x509 -req -days 365 -in smtpd.csr -signkey smtpd.key -out smtpd.crt
[root@mail ssl]# openssl rsa -in smtpd.key -out smtpd.key.unencrypted
[root@mail ssl]# mv -f smtpd.key.unencrypted smtpd.key
[root@mail ssl]# openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 365
Step 4 » Now open /etc/postfix/main.cf file .
Find and comment the below lines .#inet_interfaces = localhost #---> line no 116
#mydestination = $myhostname, localhost.$mydomain, localhost #--> line no 164
and add these lines at the bottom of the file.
myhostname = mail.krizna.com mydomain = krizna.com myorigin = $mydomain home_mailbox = mail/ mynetworks = 127.0.0.0/8 inet_interfaces = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain smtpd_sasl_auth_enable = yes smtpd_sasl_type = cyrus smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination smtpd_tls_auth_only = no smtp_use_tls = yes smtpd_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom
Step 5 » Now open /etc/postfix/master.cf file and add the below line after smtp
smtps inet n - n - - smtpd
-o smtpd_sasl_auth_enable=yes
-o smtpd_reject_unlisted_sender=yes
-o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
-o broken_sasl_auth_clients=yes Step 6 » Now start postfix and saslauthd service[root@mail ~]# service postfix start[root@mail ~]# service saslauthd start
» Issue the below commands to start the postfix and saslauthd at startup[root@mail ~]# chkconfig --level 235 postfix on[root@mail ~]# chkconfig --level 235 saslauthd on
Step 7 » Now check your smtp connectivity . just telnet localhost on port 25 and type this command ehlo localhost[root@mail ~]# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 mail.krizna.com ESMTP Postfix
ehlo localhost
250-mail.krizna.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
quit
221 2.0.0 Bye
Connection closed by foreign host.
If you get this output .. Great .. everything is fine till now.
Step 8 » Issue this command to install dovecot[root@mail ~]# yum -y install dovecot
Step 9 » After installation open /etc/dovecot/dovecot.conf file and add the below line at the end of the file. please make sure mail_location and home_mailbox in postfix configuration are using the same name.protocols = imap pop3
mail_location = maildir:~/mail
pop3_uidl_format = %08Xu%08Xv
Step 10 » Now start dovecot service[root@mail ~]# service dovecot start
» Issue the below command to start the dovecot at startup[root@mail ~]# chkconfig --level 235 dovecot on
Step 11 » Now test your pop3 connectivity .[root@mail ~]# telnet localhost 110
Trying ::1...
Connected to localhost.
Escape character is '^]'.
+OK Dovecot ready.
quit
+OK Logging out
Connection closed by foreign host.
Yes .. your server is ready to receive mails .
Step 11 » Now create users to test your configuration.[root@mail ~]# useradd -m bobby -s /sbin/nologin[root@mail ~]# useradd -m leela -s /sbin/nologin
and create passwords for the users created[root@mail ~]# passwd bobby[root@mail ~]# passwd leela
Step 12 » Test your configuration in thunderbird . Refer the below image for configuration details.
Step 13 » Now you can send and receive mails using this server. In case of any issues please check the log file /var/log/maillog )
your mail server is ready …
Step 14 » you need to add EPEL repository to install squirrelmail package. you can find latest EPEL repository rpm here ( http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/repoview/epel-release.html )[root@mail ~]# rpm -ivh http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/epel-release-6-8.noarch.rpm
Step 15 » Issue the below command to install squirrelmail.[root@mail ~]# yum install squirrelmail
This command will install squirrelmail along with apache and php.
Step 16 » Now run the below command to configure squirrelmail .[root@mail ~]# perl /usr/share/squirrelmail/config/conf.pl
»»» 1 »»» 1 »»» krizna (type Organization name ) »»» R ( return )
»»» 2 »»» 1 »»» ( hit space for empty Domain name ) and choose 3 »»» SMTP ( choose SMTP ) »»» R ( return )
»»» D »»» dovecot ( type ) »»» press enter with default
»»» s ( save and quit)
Step 17 » Open /etc/httpd/conf.d/squirrelmail.conf file and uncomment below lines# RewriteCond %{HTTPS} !=on
# RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
Step 18 » start apache service[root@mail ~]# service httpd start
» Issue the below commands to start the httpd at startup[root@mail ~]# chkconfig --level 235 httpd on
Step 19 » Now open http://serverip/webmail path in your browser . you could able to see the below page .
and after login
If any issues with apache check this page Installing Apache2 , Mysql server and PHP on Centos 6 (LAMP)
Also see :
» Setup mail server on centos 7
» Setup mail server on Ubuntu 14.04
Good luck.
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