On Thu, Mar 23, 2023 at 03:49:07AM +0800, fh--- via Postfix-users wrote: > Relay uses SMTP protocol, as well as submission.
No. The two transports are functionally equivalent, and use the same underlying delivery agent (smtp(8)). They are separate because: - As Wietse noted, and documented in ADDRESS_CLASS_README, using a separate transport for inbound mail ensures better fairness when mail is also sent to many remote destinations on busy two-way servers. - Various tuning settings can be different for the inbound "relay" transport, and it is convenient to make it separate. -- Viktor. _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org