SLES 12
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SSL Settings
2015/11/25
 
Configure SSL to encrypt connections. SMTPS uses 465/TCP, POP3S uses 995/TCP, IMAPS uses 993/TCP.
[1]
[2] Configure Postfix and Dovecot for SSL.
mail:~ #
vi /etc/services
# line 116: add

smtps              465/tcp      # Secure Mail Transfer
smtps              465/udp      # Secure Mail Transfer

mail:~ #
vi /etc/postfix/main.cf
# line 737: change

smtpd_use_tls =
yes
# line 741,742: add

smtpd_tls_cert_file =
/etc/ssl/private/server.crt

smtpd_tls_key_file =
/etc/ssl/private/server.key

smtpd_tls_session_cache_database = btree:/etc/postfix/smtpd_scache
mail:~ #
vi /etc/postfix/master.cf
# line 33-35: uncomment

smtps     inet   n     -     n     -     -     smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
# line 50: uncomment

tlsmgr     unix     -     -     n     1000?     1     tlsmgr
mail:~ #
vi /etc/dovecot/conf.d/10-ssl.conf
# line 6: change

ssl =
yes
# line 12,13: specify certificates

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

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