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.
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