365 Mail Flow rule to ID messages with different Reply To address

I'm trying to figure out how to configure a mail rule in Exchange 365 in order to identify mail that has a different Reply To address than the Sender address. I'd like the user to get a warning like a mail tip just so they are aware that it is a different address in case it turns out to be fraudulent. We've had some phishing attempts lately, and I'd like to put that in place as an extra precaution.

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Vasil Michev (MVP)Commented:
No way to achieve this with transport rules in EO, as you can only compare a header value against 'static' strings/patterns. Even if you could do the match, there is no way to generate such mail tip.

You should look into doing this client side via macro or add-in.

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sfcandersonAuthor Commented:
Updates to our Spam service has improved the issue a bit. But no solution reached.

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