Sophos UTM: Decommissioning of obsolete URL categorization services CFFS. Click here for important info.

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Valid sender email

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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