Stefan Bauer:
> Dear Users,
>
> we have the following in place:
>
> smtpd_recipient_restrictions = reject_unknown_recipient_domain,
> reject_unverified_recipient
> unverified_recipient_reject_code = 550
> unknown_address_reject_code = 550
>
> today, we had an issue with our groupware so the following was happening:
>
> NOQUEUE: reject: RCPT from unknown[ip]: 450 4.1.1 <adm...@domain.tld>:
> Recipient address rejected: unverified address: Address verification in
> progress; from=<m...@intmon01.int.domain.tld> to=<adm...@domain.tld>
> proto=ESMTP helo=<intmai01.int.domain.tld>
> Oct 11 17:19:13 kop01 postfix/lmtp[5711]: E759E301412: to=<adm...@domain.tld>,
> relay=127.0.0.1[127.0.0.1]:2003, delay=13, delays=0/0.01/13/0, dsn=4.0.0,
> status=undeliverable (host 127.0.0.1[127.0.0.1] refused to talk to me: 421
> internal error: OpenResolveAddrFolder failed)
> NOQUEUE: reject: RCPT from jir01.int.domain.tld[ip2]: 450 4.1.1
> <demo.u...@domain.tld>: Recipient address rejected: unverified address:
> host 127.0.0.1[127.0.0.1] refused to talk to me: 421 internal error:
> GetSession failed; from=<j...@domain.tld> to=<demo.u...@domain.tld>
> proto=ESMTP helo=<jir01.int.domain.tld>
>
> How do we reject unknown destinations / recipients still with a perm.
> error, but be more robust against temp errors like the ones above?
As a matter of principle, I would consider it a bug if Postfix did
a 5XX reject after Postfix received a 4XX error. It's basic error
propagation hygiene.
Wietse
Wietse
