Install Mail Server On your VPS - centos base

It's so simple

1. yum install -y exim
2. service exim start
3. chkconfig --level 235 exim on

4. For the IMAP or POP3 you can install dovecot  : yum install -y dovecot
5. service dovecot start
6. chkconfig --level 235 dovecot on
7. to test it you can try :
    telnet localhost 25 <- for the smtp port
    telnet localhost 110 <- for the imap