Ubuntu 12.04
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Configure SSL
2012/05/14
 
Configure SSL settings in order to encrypt datas in connection.
[1]
Create certificates first, see here.
[2] Configure Postfix and Dovecot for SSL
root@mail:~#
vi /etc/postfix/main.cf
# add at the last line

smtpd_use_tls = yes
smtpd_tls_cert_file = /etc/ssl/private/server.crt
smtpd_tls_key_file = /etc/ssl/private/server.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
root@mail:~#
vi /etc/postfix/master.cf
# line 22-24: uncomment

smtps     inet  n       -       -       -       -       smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
root@mail:~#
vi /etc/dovecot/conf.d/10-ssl.conf
# line 6: uncomment

ssl = yes
# line 12,13: uncomment and specify certificate

ssl_cert = <
/etc/ssl/private/server.crt

ssl_key = <
/etc/ssl/private/server.key
root@mail:~#
service postfix restart 

 * Stopping Postfix Mail Transport Agent postfix
   ...done.
 * Starting Postfix Mail Transport Agent postfix
   ...done.
root@mail:~#
service dovecot restart

dovecot stop/waiting
dovecot start/running, process 1518
  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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