On Mon 04/03/2024 at 01:05, Benny Pedersen via mailop <mailop@mailop.org> wrote: > Gareth Evans via mailop skrev den 2024-03-04 01:17: > >> Received: from atlas.bondproducts.com (unknown [23.24.6.165]) >> by mx6.messagingengine.com (Postfix) with ESMTP id ... > > https://multirbl.valli.org/fcrdns-test/23.24.6.165.html one red means > fails
Thanks, but I'm trying to look beyond the particular failure (please see my previous message). It seems FCrDNS (aka iprev) requires that "a given IP address has both forward (name-to-address) and reverse (address-to-name) [DNS] entries that match each other ... the forward and reverse lookup for the sending relay have to match ..." https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS Is this situation: Received: from atlas.bondproducts.com (unknown [23.24.6.165]) <-- NOTE IP HERE by mx6.messagingengine.com (Postfix) with ESMTP id ... [...] Received: from users.shellworld.net (users.shellworld.net [50.116.47.71]) by atlas.bondproducts.com (Postfix) with ESMTP id ... $ dig -x 23.24.6.165 ;; ANSWER SECTION: 165.6.24.23.in-addr.arpa. 3600 IN PTR 23-24-6-165-static.hfc.comcastbusiness.net. ...(ie mismatch between relay and PTR host) unusual? Thanks, Gareth _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
