Hi,
my last info is, that office365 does not support authentication with external connectors. However you can authenticate O365 with your smtp relay. I run some mixed authentication. We check the source ip's¹ from microsofts range, check the O365 client cert and check the mail-from addresses. https://endpoints.office.com/endpoints/worldwide?clientrequestid=b10c5ed1-bad1-445f-b386-b919946339a7 Make sure, you monitor microsofts list of pub-ips so you keep up with new ranges. Stefan -----Ursprüngliche Nachricht----- Von: Kevin A. McGrail via mailop <[email protected]> Gesendet: Samstag 18 Juli 2020 21:19 An: mailop <[email protected]> Betreff: [mailop] Outbound from M365 to relay off our SMTP with SMTPAUTH Hi All, I've got a long outstanding Anyone out there know what I'm missing in trying to have M365 relay all outgoing mail through our on-premise SMTP servers? I've opened support tickets but they went to evolveip.net with no response. Here's what I used to do: - Admin | Exchange -> Mail Flow | Connectors -> create new connector - from 365 to partner - use when email sent to these domains - list domain names - route email through smart hosts - set to smtp.pccc.com Has that setting been moved? Does it not work with SMTP AUTH anymore? Happy to share more info. Regards, KAM
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