I specifically am looking for an iOS email client that supports IMAP's ability to delete messages "in place", i.e. without moving them to some "trash" folder. I would want to be able to view deleted messages appropriately marked (or greyed out) in their original folder, with a separate option to expunge either a single message or all deleted messages in a folder.
I can do all these things with the default Mail.app on OS X, so it's especially frustrating that Apple doesn't offer equivalent support on iOS. Does anyone know of another iOS email client that does this right?
And for extra credit, I'd love to have these features too:
- True Junk mail filtering
- Ability to subscribe/unsubscribe from IMAP folders