Marked for deletion meaning -- moved to the server Deleted folder?
Or not moved?
Please clarify, but in general, if messages are not moved to server's Deleted:
- Please long press on the account -> options and folders -> folders
- Let it refresh
- Find the server's Deleted folder, tap its name, choose "Sync with Deleted".
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If the messages are moved to Deleted but are not completed deleted from the original folder (and are instead marked with \Deleted flag, which you can see in some mail app) -- then it must be the EXPUNGE option that somehow got turned off.
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Finally, the "empty deleted folder when closing the app" does not, by design, empty any server side folders.
The thinking is that for server folders, you may have moved some messages using a different mail app or web mail, say by mistake, and may need to go back and undo -- and then Aqua Mail deleting those messages would be a small disaster.