Was just fine Rated 3 out of 5 stars

Update 3.0.1 changed the notification icon. It used to be an
envelope and it was fine. Now it is an X which in no way identifies itself and has nothing to do with mail as an icon. Takes away from an otherwise good addon.

This review is for a previous version of the add-on (3.0.1).  This user has other reviews of this add-on.