Fedora 23
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SSL Settings (Postfix & Dovecot)2015/11/11

Configure SSL to encrypt connections. SMTPS uses 465/TCP, POP3S uses 995/TCP, IMAPS uses 993/TCP.
[2] Configure Postfix and Dovecot for SSL.
[root@mail ~]#
vi /etc/postfix/main.cf
# add follows to the end

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 28-30: 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: specify certificates

ssl_cert = <

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

[root@mail ~]#
systemctl restart dovecot

[3] For Email Client's settings, (Windows Live Mail)
Open the property of an account and change settings like following example. (if you use PO3S, input '995 for incoming mail)
[4] Click sync button on Windows Live Mail, then following warning is shown because certificates is own created on your server. It's no ploblem. Click 'Yes' to proceed, then it's possible to send/receive emails through SSL connection.
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