Fedora 18
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Configure SSL
Configure SSL settings in order to encrypt datas in connection.
[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/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 22-24: uncomment

smtps       inet   n       -       n       -       -       smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
[root@mail ~]#
vi /etc/dovecot/conf.d/10-ssl.conf
# line 8: change

ssl =
# line 14,15: uncomment and specify certificate

ssl_cert = <

ssl_key = <
[root@mail ~]#
systemctl restart postfix.service

[root@mail ~]#
systemctl restart dovecot.service

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.