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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