Ubuntu 10.04
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Configure SSL2010/07/25
  Configure for SSL in order to encrypt datas in connection.

[1] Create certificates first, see here.
[2] Configure for SSL
root@mail05:~#
vi /etc/postfix/main.cf


# add at the bottom

smtpd_use_tls = yes
smtpd_tls_cert_file = /etc/ssl/CA/server.crt
smtpd_tls_key_file = /etc/ssl/CA/server.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache


root@mail05:~#
vi /etc/postfix/master.cf


# line 17: uncomment

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

root@mail05:~#
vi /etc/dovecot/dovecot.conf


# line 95: change

ssl =
yes


# line 100,101: uncomment and specify certificates

ssl_cert_file =
/etc/ssl/CA/server.crt

ssl_key_file =
/etc/ssl/CA/server.key


root@mail05:~#
/etc/init.d/postfix restart

 * Stopping Postfix Mail Transport Agent postfix
  ...done.
 * Starting Postfix Mail Transport Agent postfix
  ...done.
root@mail05:~#
/etc/init.d/dovecot restart

  * Restarting IMAP/POP3 mail server dovecot
  ...done.
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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