CentOS 5
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Configure SSL
2015/01/19
 
Configure for SSL in order to encrypt datas in connection.
[1]
[2] Configure Postfix and Dovecot for SSL
[root@mail ~]#
vi /etc/postfix/main.cf
# add at the bottom

smtpd_use_tls = yes
smtpd_tls_cert_file = /etc/pki/tls/certs/server.crt
smtpd_tls_key_file = /etc/pki/tls/certs/server.key
smtpd_tls_session_cache_database = btree:/etc/postfix/smtpd_scache
[root@mail ~]#
vi /etc/postfix/master.cf
# line 14-15: uncomment

smtps       inet   n       -       n       -       -       smtpd
  -o smtpd_tls_wrappermode=yes
[root@mail ~]#
vi /etc/dovecot.conf
# line 85: uncomment

ssl_disable = no
# line 91,92: uncomment and specify certificate

ssl_cert_file =
/etc/pki/tls/certs/server.crt

ssl_key_file =
/etc/pki/tls/certs/server.key
[root@mail ~]#
/etc/rc.d/init.d/postfix restart

Shutting down postfix:
[ OK ]

Starting postfix:
[ OK ]

[root@mail ~]#
/etc/rc.d/init.d/dovecot restart

Stopping Dovecot Imap:
[ OK ]

Starting Dovecot Imap:
[ OK ]

  Configure on client. Change settings like following example. (if you use PO3S, input '995 for incoming mail)
 
  Click syncronize on Windows Live Mail, then following warning is shown because certificate file is created on your server. It's no ploblem. Click 'Yes' to Proceed, then it's possible to send/receive emails trough SSL connection.
 
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