I am seeing the subjected error for a small percentage of messages, and
then those message stay in the deferred queue.
from the log:
postfix/local[1124]: warning: unexpected protocol delivery_request_protocol
from private/bounce socket (expected: delivery_status_protocol)
On 1/1/23 19:01, Wietse Venema wrote:
You changed the 'bounce' service entry in master.cf, and replaced
the bounce program name with the name of some program that does not
implement the delivery_status service protosol. Don't do that.
Also, you are receiving mail, presumably via SMTP, and then bouncing
it. Don't do that.
On 03.01.23 03:18, Demi Marie Obenour wrote:
Is there any reason for mail received on port 25 to be bounced? Or should
bouncing be reserved for authenticated mail submission?
the safe behaviour is to reject mail you know is not welcome
(virus/spam/phish) or deliverable (nonexistent address, domain etc)
and only bounce outgoing mail.
mail received via authenticated submission on ports 465/587 can be
considered outgoing, although you may decide not to receive viruses, invalid
addresses/domains etc from them.
You may restrict authenticated mails to local senders, so you don't bounce
to external recipients.
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