The pointers have been given before. This is your problem: https://www.spamhaus.org/query/ip/79.134.251.203
Daniel 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 >> ... _______________________________________________ swinog mailing list [email protected] http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
