Has trouble with sorting and deleting Crashes trying to delete IMAP messages every time. Although It is the ONLY app I found capable of sorting messages and showing Internet headers  the reliability of some of these advanced function is only so-so for large numbers of messages (10k). Sorting by sender does not appear to work at all and sorting by date (sent) vs. received date only sort of worked. So overall a bit disappointing.
December 31 2016