Create Cert & Key:


openssl req -new -x509 -nodes -days 1530 -out server.crt -keyout server.key
mkdir /etc/mailssl
chmod 700 /etc/mailssl
cp server.* /etc/mailssl


Postfix SSL config

Edit /etc/postfix/main.cf:

#SSL stuff
smtpd_tls_cert_file = /etc/mailssl/server.crt
smtpd_tls_key_file = /etc/mailssl/server.key

To make smtps work on port 465 which it should, then you have to edit /etc/postfix/master.cf:

Uncomment the following near the top (note it is the stanza which starts with smtps and NOT smtp)

smtps     inet  n       -       n       -       -       smtpd
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject

The above didn't work,I had to comment the two lines about sasl_auth and client_restrictons to make it work.

smtps     inet  n       -       n       -       -       smtpd
  -o smtpd_enforce_tls=yes
  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject