Viktor Dukhovni via Postfix-users:
> On Thu, Apr 09, 2026 at 04:49:38PM -0700, Randy Bush via Postfix-users wrote:
>
> > but then postfix seems to be telling the sender to retry later 450.
> >
> > 2026-04-09T23:15:36.547760+00:00 m0 postfix/smtpd[4892]: NOQUEUE:
> > reject: RCPT from
> > mail-australiaeastazrln10220002.outbound.protection.outlook.com[52.103.200.2]:
> > 450 4.1.1 <[email protected]>: Recipient address rejected: unverified
> > address: delivery temporarily suspended: connect to
> > psg.com[147.28.0.62]:25: Connection timed out;
> > from=<[email protected]> to=<[email protected]> proto=ESMTP
> > helo=<SY8PR01CU002.outbound.protection.outlook.com>
>
> Consider changing the safety-net default
>
> unverified_recipient_reject_code = 450
>
> to:
>
> unverified_recipient_reject_code = 550
It's replying with 4XX because of:
delivery temporarily suspended: connect to psg.com[1 47.28.0.62]:25:
Connection timed out
When that error expires from the queue manager 'dead host' list,
the setting unverified_recipient_reject_code comes into play.
Wietse
_______________________________________________
Postfix-users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
