Configure SSL

Configure SSL 2014/07/21

	Configure SSL to encrypt connections. SMTPS uses 465/TCP, POP3S uses 995/TCP, IMAPS uses 993/TCP.
[1]	Create certificates first, Refer to here.
[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 26-28: 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 =  yes # line 14,15: specify certificates ssl_cert = < /etc/pki/tls/certs/server.crt ssl_key = < /etc/pki/tls/certs/server.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 syncronize 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.