# SMTP (allowing for STARTTLS); necessary for mail server to mail server banter
-A INPUT -p tcp --dport 25 -j ACCEPT
# SMTPS, for mail server to mail user agent communication
# SMTP (allowing for STARTTLS); necessary for mail server to mail server banter
-A INPUT -p tcp --dport 25 -j ACCEPT
# SMTPS, for mail server to mail user agent communication