They shot themselves in the foot. The email was sent to abuse@vodafone.cz It apparently forwards on to spamrd@vf.dkm.cz and this forwarding breaks SPF, and domains with strict -all SPF records like RFG's tristatelogic.com will fail SPF validation. I guess it is an interesting way to cut down on abuse, as measured by reducing traffic to your abuse mailbox. --srs On 12/12/20, 6:49 PM, "anti-abuse-wg on behalf of Ronald F. Guilmette" <anti-abuse-wg-bounces@ripe.net on behalf of rfg@tristatelogic.com> wrote: In message <83900D1F-3EB8-4D72-8A8E-2086BCD0D4AB@devnull.ru>, Sergey Myasoedov <sergey@devnull.ru> wrote: >my two cents on this: >http://www.openspf.net/Why?s=3Dmfrom;id=3Drfg%40tristatelogic.com;ip=3D80.= >95.99.97;r=3Dmail2.dkm.cz > >There are many SMTP relays in the world checking SPF record for the >incoming mail and providing a diagnostics with openspf.net web. That would be fine, BUT... there isn't a goddamn single thing wrong with my domain's SPF record. The brain damage is on THEIR END. Apparently they don't even know how to check SPF TXT properly. >But unfortunately this website is down for almost two years and this >diagnostics leads to nowhere. Yea, there's that also. Basically, it is stupid layered on top of stupid. It's a stupid sandwich. Regards, rfg