Does any one have a clue what DNSNULL means in the following context of a mail delivery error?
<....@bluewin.ch mailto:claudine.beaud@bluewin.ch> (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 andreas@fink.org mailto:andreas@fink.org https://www.fink.org https://www.fink.org/ Mobile: +41-78-6677333 Office: +41-61-6666330 Home: +41-61-6666345 Skype: andreasfink Jabber/XMPP: andreas@fink.org mailto:andreas@fink.org ICQ: 8239353 Twitter: @kiwi66 PGP Key: https://www.fink.org/FILES/afink-pgp.asc ------------------------------------------------------------------