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Sophos altering destination address

I have a strange situation where an email address contains an authentication key for an SMS provider. It leaves our system with a capital A, Sophos processes the email and then it returns it to O365 with a lowercase A which causes authentication to fail. If I edit the outbound Sophos rule to add an exception for emails sent to that destination domain, it works perfectly fine and goes out with a capital A.

Why would Sophos be altering a destination address and changing the case?

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    I would recommend getting a Technical Support case created for this and please share the case number here once done.
    This is because outbound scanning does not usually rewrite anything, only the inbound scanning have these kind of features like Time of Click - so this is out of the ordinary expectations.