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 appropriate delisting URL. The request in question has been fixed now and will provide proper answers again.
Sorry for the inconvenience. Cheers Marcel From: [email protected] <[email protected]> On Behalf Of Andreas Fink Sent: Donnerstag, 11. Juli 2019 11:33 To: [email protected] Subject: [swinog] bluewin & DNSNULL Does any one have a clue what DNSNULL means in the following context of a mail delivery error? <[email protected]<mailto:[email protected]>> (mx-v02.bluewin.ch<http://mx-v02.bluewin.ch>: 554 mxbw.lb.bluewin.ch<http://mxbw.lb.bluewin.ch> vim 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> Arrival-Date: Thu, 11 Jul 2019 11:19:58 +0200 ... Andreas Fink ------------------------------------------------------------------ Paradieshofstrasse 101, 4054 Basel, Switzerland [email protected]<mailto:[email protected]> https://www.fink.org<https://www.fink.org/> Mobile: +41-78-6677333 Office: +41-61-6666330 Home: +41-61-6666345 Skype: andreasfink Jabber/XMPP: [email protected]<mailto:[email protected]> ICQ: 8239353 Twitter: @kiwi66 PGP Key: https://www.fink.org/FILES/afink-pgp.asc ------------------------------------------------------------------
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