Re: reject=553 5.3.0 127.0.0.2 due to unreachable DNS resolver

On 01.02.2025 11:41 Uhr Grant Taylor wrote:

On 2/1/25 08:54, Marco Moock wrote:

I had a situation where my DNS resolver was unreachable for my
machine. 

 
I would expect your logs to indicate /temporary/ failures in the case
when a normally reachable / usable DNS server was unreachable /
unusable.

There are no such messages.

Jan 31 23:37:37 pi-dach sm-mta[1034127]: ruleset=check_relay,
arg1=[157.230.63.40], arg2=157.230.63.40, relay=[157.230.63.40],
reject=553 5.3.0 127.0.0.2 

This is from my system.

The "553 5.3.0" indicates a permanent error, not a temporary error
that I'd expect.
 

The remote machine gave
 
<uk-legal-moderated@moderators.isc.org>: host
pi-dach.dorfdsl.de[82.139.252.17] said: 553 5.3.0 127.0.0.2 (in
reply to MAIL FROM command) 

This is from the logs of the remote.

That sounds like your system was trying to send an email and the
remote system refused to accept it.

No, my system rejected the mail from the remote. The postmaster of the
remote contacted me and gave me the bounce.

--
kind regards
Marco

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