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I agree, this is clearly worse, whether it's "your e-mail has been rejected" or "this server is not configured to accept 'reactions'", it's unnecessarily hostil

I agree, this is clearly worse, whether it's "your e-mail has been rejected" or "this server is not configured to accept 'reactions'", it's unnecessarily hostile to a user who probably doesn't understand that Microsoft has done something non-standard. And they will probably assume that you don't know what you're doing, because your e-mail doesn't work.

Arnavion 2y ago
The reaction sender's Exchange server would see it and could decide to not display the rejection to the user, since the Exchange server knows it's "just" a reaction that was rejected.