I recently started using Postbox 3.0, and I have a problem with deleted email duplication.
I get about 50 - 75 daily emails at my Outlook.com account. I view them in Postbox and delete them there, usually. I sometimes view and delete them on my iPhone or iPad, as well, without using Postbox. Through some combination of behaviors and settings, I manage to empty my Outlook account trash, but then find messages returned to the trash in multiples. Despite my daily deletions being around 50 emails or so, I end up with over 3000 items in the deleted folder.
Any idea of what I might be doing wrong?