Sophos Email customers using IP-based mailflow rule connectors must migrate to certificate-based configuration by March 31st. To see if you're affected Click Here.

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Valid sender email

Stuart James

https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365

For Option 3, Microsoft "Any email address in one of your Microsoft 365 or Office 365 verified domains. This email address does not need a mailbox." - but it appears that Sophos insists that the sender address is valid when routing outgoing emails through Sophos.

Is there a way to turn this off? I can't find the setting anywhere.



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  • +1

    You could simply exclude this sender from using CEMA via Connector. 

    In Central every Mailbox needs to be configured. But if you setup the mailbox not to be transfered to CEMA, it should be fine. This would mean, the mailbox is not scanned. 

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