Viktor Dukhovni via Postfix-users:
> On Mon, Apr 22, 2024 at 12:21:01AM -0400, 785 243 via Postfix-users wrote:
>
> > Recently i'm seeing a few messages deferred with status=deferred
> > (bounce or trace service failure)
> >
> > instead of status=deferred (host .. said: 450 ...)
> >
> > from the logs:
> >
> > postfix/smtp[272605]: warning: unexpected protocol
> > delivery_request_protocol from private/bounce socket (expected:
> > delivery_status_protocol)
>
> Your master.cf file has bad settings. Post the verbatim (no rewrapping
> of whitespace of line breaks) output of "postconf -Mf".
>
> The "bounce" service entries should be:
>
> # Possibly chrooted, if Debian prefers that.
> #
> bounce unix - - n - 0 bounce
> defer unix - - n - 0 bounce
> trace unix - - n - 0 bounce
>
> Or perhaps the "bounce" service executable has been replaced with a link
> to a delivery agent? The "real" bounce service supports the expected
> protocol.
Replacing the 'bounce' service with the 'discard' delivery agent
has never been a supported configuration. It just happened to "work"
because of sloppy protocol checks.
Wietse
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