On 11 Jul 2019, at 14:55, Daniel Stirnimann <[email protected]> wrote: > > The pointers have been given before. This is your problem: > > https://www.spamhaus.org/query/ip/79.134.251.203 > > Daniel
Yes above is my problem but at the same time it can not be the reason for mail delivery to bluewin.ch <http://bluewin.ch/> coming back with a cryptic DNSNULL error Spamhaus has a issue with a customer of mine but they have not shown any proof. Above IP however is not in the disputed IP range, its my my well maintained mailserver which has never sent any spam and is not listed as sending any spam anywhere else. What Spamhaus is doing is trying to get ISPs to cancel contracts with well paying customers on first call (no judge, no proof) by putting the ISP's whole IP range into a blacklist (a /19 !) and thus punishing legitimate 3rd parties as well. This is called coercion (Nötigung) which is a criminal offense punishable by law for up to 3 years in jail. We will see if Spamhaus prefers to go to jal or change their blacklisting policy. Never the less. Sending emailst o bluewin.ch <http://bluewin.ch/> has never been affected. I sent emails successfuly yesterday to bluewin users without a problem. I don't think Spamhaus's blacklist are being used by bluewin.ch <http://bluewin.ch/> as otherwise we would have had issues a lot earlier. So this doesn't explain any DNSNULL error. And frankly, the error message is really stupid misleading... > > On 11.07.19 14:25, Andreas Fink wrote: >> Except that this is not applicable. In my case my mailserver is not >> hosted at Swisscom but on my own infrastructure, is on the same IP since >> years, has proper MX records and reverse DNS entries and has delivered >> email to the same bluewin customer yesterday successfully. Only the >> reply on that receiver today which I received and replied again got >> rejected. And the response is cryptic to me. >> >> And if you mail to [email protected] <mailto:[email protected]> you get >> the same error... >> >> So who is this famous DNSNULL I should contact? >> >> >> >>> On 11 Jul 2019, at 13:49, Florin sfetea <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> See >>> https://community.swisscom.ch/t5/E-Mail/Bluewin-akzeptiert-E-Mails-von-eigener-Domain-nicht/td-p/570002 >>> >>> >>> Beste Grüsse, Regards si s-auzim de bine >>> Florin Sfetea >>> >>> *From: *[email protected] >>> <mailto:[email protected]> >>> *Sent: *Thursday, July 11, 2019 12:00 >>> *To: *[email protected] <mailto:[email protected]> >>> *Subject: *swinog Digest, Vol 174, Issue 3 >>> >>> Send swinog mailing list submissions to >>> [email protected] <mailto:[email protected]> >>> >>> To subscribe or unsubscribe via the World Wide Web, visit >>> http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog >>> or, via email, send a message with subject or body 'help' to >>> [email protected] >>> <mailto:[email protected]> >>> >>> You can reach the person managing the list at >>> [email protected] <mailto:[email protected]> >>> >>> When replying, please edit your Subject line so it is more specific >>> than "Re: Contents of swinog digest..." >>> >>> >>> Today's Topics: >>> >>> 1. bluewin & DNSNULL (Andreas Fink) >>> >>> >>> ---------------------------------------------------------------------- >>> >>> Message: 1 >>> Date: Thu, 11 Jul 2019 11:32:38 +0200 >>> From: Andreas Fink <[email protected] <mailto:[email protected]>> >>> To: "[email protected] <mailto:[email protected]>" <[email protected] >>> <mailto:[email protected]>> >>> Subject: [swinog] bluewin & DNSNULL >>> Message-ID: <[email protected] >>> <mailto:[email protected]>> >>> Content-Type: text/plain; charset="us-ascii" >>> >>> >>> Does any one have a clue what DNSNULL means in the following context >>> of a mail delivery error? >>> >>> >>> >>> <[email protected] >>> <http://bluewin.ch/> <mailto:[email protected]>> >>> (mx-v02.bluewin.ch >>> <http://mx-v02.bluewin.ch/> <http://mx-v02.bluewin.ch/>: >>> 554 mxbw.lb.bluewin.ch >>> <http://mxbw.lb.bluewin.ch/><http://mxbw.lb.bluewin.ch/> vim >>> dzmsp-mxin12.bluewin.ch >>> <http://dzmsp-mxin12.bluewin.ch/> <http://dzmsp-mxin12.bluewin.ch/> >>> Swisscom AG IP: 79.134.251.203, You are not allowed >>> to send us mail. Please see DNSNULL if you feel this is in >>> error)Reporting-MTA: dns; mail.fink.org >>> <http://mail.fink.org/> <http://mail.fink.org/> >>> Arrival-Date: Thu, 11 Jul 2019 11:19:58 +0200 >>> ...
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