I have the same issue. I don’t want any email to play a sound or vibrate.
In the last versions, I managed to achieve this by configuring the “resting period”, where all alarms are silenced, to be 23:59 hours a day. I don’t know if this was the recommended way, but it worked like a charm for me.
Since yesterday, every mail makes my phone vibrate… How can I disable notifications in the new version?