Hello, I am seeing in my logs some bounces messages (empty sender) from various outbound.protection.outlook.com servers. All those bounce messages are directed towards one specific email address which is probably used as an envelope field in a spam run.
Now my question is: if it comes from outbound servers for outlook.com, shouldn't the mails also pass through some kind of inbound servers at outlook.com? If that's the case, how comes that those messages which surely have a wrong DMARC, SPF and DKIM pass through the incoming gateways? I have a attached a list of servers sending the bounces, in case it may help. Feel free to contact me privately if you need more informations. Regards
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smime.p7s
Description: S/MIME Cryptographic Signature
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