Hey Sabatino,I talked to the developers and they said that the way that defender works is when it scans it can sometimes say hey this might be a virus and marks it as a virus then later on once Microsoft does more scans on it and does its internal stuff then it goes this isn't a virus. So this issue is with just the way that defender works. I'm going to make this ticket into a feature request to add the ability for defender to rescan emails then if it comes back as not a virus it will send it through. Kind Regards
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