Content filters on the final destination domain rejecting the mail in a way that isn’t a permanent failure.
Laura Sent from my iPhone > On Apr 18, 2022, at 9:49 PM, Mike Hammett via mailop <mailop@mailop.org> > wrote: > > > Reported error: 554 5.4.14 Hop count exceeded - possible mail loop > ATTR34 [BN1NAM02FT041.eop-nam02.prod.protection.outlook.com] > DSN generated by: CH2PR18MB3414.namprd18.prod.outlook.com > > > I send an email from the same environment (my Zimbra server) to a forwarding > account in that environment through the same gateway (Proxmox Mail Gateway) > to the same platform (365). One set succeeds, while the other gives me the > above error. I've verified that the settings on the two forwarding accounts > are the same. The differences are that the failures are from a PBX to a > customer domain whereas the testing is from a mail client to our domain. > > What gives? > > One has 11 message hops to delivery, the other has 16 hops to failure. > > Any ideas? > > > > ----- > Mike Hammett > Intelligent Computing Solutions > > Midwest Internet Exchange > > The Brothers WISP > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop
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