SSL Settings2015/12/06

	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 Cyrus-IMAP for SSL.

mail:~ #

cp /etc/ssl/private/server.* /etc/sasl2/

mail:~ #

chown cyrus:mail /etc/ssl/private/server.*

mail:~ #

vi /etc/cyrus.conf

# line 15,17: uncomment

imaps         cmd="imapd -s" listen="imaps" prefork=0
pop3s         cmd="pop3d -s" listen="pop3s" prefork=0

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 702: change

smtpd_use_tls =

yes

# add to the end

smtpd_tls_cert_file = /etc/sasl2/server.crt
smtpd_tls_key_file = /etc/sasl2/server.key
smtpd_tls_session_cache_database = btree:/etc/postfix/smtpd_scache

mail:~ #

vi /etc/postfix/master.cf

# line 13-14: uncomment

smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes
-o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes

# line 23: uncomment

tlsmgr unix - - n 1000? 1 tlsmgr

mail:~ #

vi /etc/imapd.conf

# add to the end

tls_cert_file: /etc/sasl2/server.crt
tls_key_file: /etc/sasl2/server.key

mail:~ #

/etc/init.d/postfix restart

mail:~ #

/etc/init.d/cyrus restart

[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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