Really buggy...
I thought that I had reviewed AirMail before now, but it cannot be found. I used to LOVE AirMail – and still do. However, most recent update not only did not fix the syncing problem I was having, it is now showing "Inbox Zero" every time I try to delete a message. Thankfully, the messages are still found on my desktop version. Syncing has always been slow and buggy on iOS, but the great functionality still outweighed the buggy syncing. Not so much any more. Im sure theyll fix it, but beware purchase or update before then...
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Airmail - Your Mail With You, v1.6.6