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 abuse@bluewin.ch mailto:abuse@bluewin.ch you get the same error...
So who is this famous DNSNULL I should contact?
On 11 Jul 2019, at 13:49, Florin sfetea <f_sfetea@yahoo.com mailto:f_sfetea@yahoo.com> wrote:
See https://community.swisscom.ch/t5/E-Mail/Bluewin-akzeptiert-E-Mails-von-eigen... Beste Grüsse, Regards si s-auzim de bine Florin Sfetea *From: *swinog-request@lists.swinog.ch mailto:swinog-request@lists.swinog.ch *Sent: *Thursday, July 11, 2019 12:00 *To: *swinog@lists.swinog.ch mailto:swinog@lists.swinog.ch *Subject: *swinog Digest, Vol 174, Issue 3 Send swinog mailing list submissions to swinog@lists.swinog.ch mailto:swinog@lists.swinog.ch 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 swinog-request@lists.swinog.ch mailto:swinog-request@lists.swinog.ch You can reach the person managing the list at swinog-owner@lists.swinog.ch mailto:swinog-owner@lists.swinog.ch 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 <afink@list.fink.org mailto:afink@list.fink.org> To: "swinog@swinog.ch mailto:swinog@swinog.ch" <swinog@swinog.ch mailto:swinog@swinog.ch> Subject: [swinog] bluewin & DNSNULL Message-ID: <75DA5D85-1A68-4D10-94B8-6237FD9D54DB@list.fink.org mailto:75DA5D85-1A68-4D10-94B8-6237FD9D54DB@list.fink.org> 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? <....@bluewin.ch http://bluewin.ch/ mailto:claudine.beaud@bluewin.ch> (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 ...