[Postfix] title=Mail server (SMTP) description=Postfix is a high-performance mail transport agent ports=25/tcp [Postfix SMTPS] title=Mail server (SMTPS) description=Postfix is a high-performance mail transport agent ports=465/tcp [Postfix Submission] title=Mail server (Submission) description=Postfix is a high-performance mail transport agent ports=587/tcp