Fedora 11
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Configure SSL2009/06/17
  Configure for SSL in order to encrypt datas in connection.

[1] Create certificates first, see here.

[2] Configure Postfix and Dovecot
[root@mail certs]#
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 certs]#
vi /etc/postfix/master.cf


# line 17-18: uncomment

smtps       inet   n       -       n       -       -       smtpd
  -o smtpd_tls_wrappermode=yes

[root@mail certs]#
vi /etc/dovecot.conf


# line 89: uncomment

ssl = yes

# line 95,96: uncomment and specify certificate

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


ssl_key_file =
/etc/pki/tls/certs/server.key


[root@mail certs]#
/etc/rc.d/init.d/postfix restart

Shutting down postfix:
[ OK ]

Starting postfix:
[ OK ]

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

Stopping Dovecot Imap:
[ OK ]

Starting Dovecot Imap:
[ OK ]
Configure on client. Change settings like following example.
 
Run send/receive email on Outlook Express, then following warning is shown because certificate file is not installed in your system. It's no ploblem. Click 'Yes' to Proceed.
 
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