Postfix tls

Create the certificates for the Postfix server. Just make sure that the Common Name equals the mail server hostname:

# cd /etc/postfix/sasl/
# openssl genrsa -out smtpd.key 1024
# openssl req -new -key smtpd.key -x509 -out smtpd.cert

Edit /etc/postfix/main.cf :

smtpd_tls_cert_file = /etc/postfix/sasl/smtpd.cert
smtpd_tls_key_file = /etc/postfix/sasl/smtpd.key
tls_random_source = dev:/dev/urandom
tls_daemon_random_source = dev:/dev/urandom
smtpd_use_tls = yes
smtpd_tls_auth_only = yes

Now smtp server use ssl :D