Does any one have a clue what DNSNULL means in the following context of a mail 
delivery error?



 <....@bluewin.ch <mailto:claudine.be...@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
andr...@fink.org <mailto:andr...@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: andr...@fink.org <mailto:andr...@fink.org>    
ICQ: 8239353
Twitter: @kiwi66  PGP Key: https://www.fink.org/FILES/afink-pgp.asc
------------------------------------------------------------------





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