On 7/28/19 7:58 AM, Loren Engrav via Mailman-Users wrote: > Greetings > > I use Mailman (2.1.26) at Site5.com. > > Several of the member addresses are @yahoo.com @aol.com and @outlook.com. > > Messages to these address bounce and fail and / or just fail. Messages to > other addresses pass. > > The latest notice(s) are summarized below. > > Site5 people cannot seem to fix this. > > Any advice for me / Site5? (I am not expert at this) ... > Final-Recipient: rfc822; engravosaurus...@aol.com > <mailto:engravosaurus...@aol.com> > Original-Recipient: rfc822;engravosaurus...@aol.com > <mailto:engravosaurus...@aol.com> > Action: failed > Status: 4.4.2 > Diagnostic-Code: X-Postfix; delivery temporarily suspended: lost connection > with mx-aol.mail.gm0.yahoodns.net > <http://mx-aol.mail.gm0.yahoodns.net/>[98.136.101.116] while sending RCPT TO ... > Final-Recipient: rfc822; engravosau...@yahoo.com > <mailto:engravosau...@yahoo.com> > Original-Recipient: rfc822;engravosau...@yahoo.com > <mailto:engravosau...@yahoo.com> > Action: failed > Status: 4.4.2 > Diagnostic-Code: X-Postfix; delivery temporarily suspended: lost connection > with mta5.am0.yahoodns.net <http://mta5.am0.yahoodns.net/>[98.137.159.24] > while sending RCPT TO
These are 4xx statuses which are retryable so presumably they are retried until the retry time limit is up and are finally turned into permanent failures. The recipient Yahoo MX servers, more than one, are disconnecting after sending a (presumably OK) response to MAIL FROM. This means there is something about the sending server that they don't like. There are different sending servers here as well. They are gateway1.unifiedlayer.com and gateway13.unifiedlayer.com. This is not a DMARC issue nor anything that can be fixed with DKIM, because the receiving server disconnects before it has seen any of the message. It has seen enough to validate SPF because that only requires the MAIL FROM domain, but I've never personally seen or heard of servers disconnecting that suddenly because of an SPF failure, but it's possible. It's also possible that the sending IPs are blacklisted by Yahoo (and maybe by Microsoft - Outlook). AOL's MX is Yahoo. My best guess is Yahoo really doesn't like unifiedlayer.com, but is waiting for the recipient address before hanging up because it may accept special addresses like maybe postmaster. This is something that has to be worked out between unifiedlayer.com and Yahoo and maybe outlook.com. -- Mark Sapiro <m...@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
