As pointed out by Daniel, the original issue was caused by a listing of this IP
on Spamhaus SBL and Bluewin does in fact use Spamhaus as a RBL provider and has
done so for quite some time.
As to the "DNSNULL" part of the error message, this was caused by an issue in
the lookup of the
Hello Benoît
Put simply, we do DNS requests for MX or A records for the given sender domain,
if either exists this check is passed.
As for the issue at hand: the DNS servers of your customer are (were) not
properly reachable from our IP ranges or more specifically we are (were) unable
to get
We were able to identify and reliably reproduce the problem in out testing
environment, it is related to the TLS-Offloading which interferes with the
traffic in some cases and brakes the communication with sending RSET commands
and not handling the responses correctly.
Thanks to all who
Hi Dan,
We don't see a general pattern, but can you contact me off-list so we might
figure out if there is a wider issue here?
Regards
Marcel
-Original Message-
From: swinog-boun...@lists.swinog.ch [mailto:swinog-boun...@lists.swinog.ch] On
Behalf Of Daniel Kamm
Sent: Monday, November
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