SSL Settings2016/06/01

	Configure SSL settings in order to encrypt datas in connection. SMTPS uses 465/TCP, POP3S uses 995/TCP, IMAPS uses 993/TCP.
[1]	Create certificates first, see 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/ssl/private/server.crt
smtpd_tls_key_file = /etc/ssl/private/server.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache

root@mail:~#

vi /etc/postfix/master.cf

# line 28-30: uncomment

smtps     inet  n       -       -       -       -       smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes

root@mail:~#

vi /etc/dovecot/conf.d/10-ssl.conf

# line 6: change

ssl =

yes

# line 12,13: uncomment and specify certificate

ssl_cert = <

/etc/ssl/private/server.crt

ssl_key = <

/etc/ssl/private/server.key

root@mail:~#

systemctl restart postfix dovecot

[3]	For Client's settings, Change settings like following example. (if you use PO3S, input '995 for incoming mail)

[4]	Click syncronize button on Windows Live Mail, then following warning is shown because certificates is self-signed one 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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