Postfix

Overview

Postfix handles email delivery for the mail stack.

Field	Value
Service	postfix@-.service
Ports	25 (SMTP), 587 (Submission)
Integration	OpenDKIM, Postsrsd, Dovecot

Components

Service	Purpose
opendkim.service	DKIM signing for outgoing mail
postsrsd.service	Sender Rewriting Scheme

Postfix delivers to Dovecot's LMTP for local mailboxes and relays outgoing mail through configured transports.