CentOS 7
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SSL Settings
2014/07/21
 
Configure SSL to encrypt connections.
[1]
[2] Configure Postfix and Dovecot for SSL.
[root@mail ~]#
vi /etc/postfix/main.cf
# add 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 dovecot

[3] If Firewalld is running, allow SMTPS/POP3S/IMAPS services. SMTPS uses 465/TCP, POP3S uses 995/TCP, IMAPS uses 993/TCP.
[root@dlp ~]#
firewall-cmd --add-service={pop3s,imaps} --permanent

success
[root@dlp ~]#
firewall-cmd --add-port=465/tcp --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[4] 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)
[5] 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.
 
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