Apple Mail won't delete messages Lately I have problems deleting messages in Apple Mail (Mac OS 10.11).
I select one or multiple messages, hit delete key and get an error saying that these messages have already been "deleted" (moved to the trash folder in Mail): that's not true, the trash folder is empty and I'm stuck with the problem.

What should I do? I tried also to rebuilt Mail's mailbox with Onyx utility, but the problem persist.

Any idea? Thanks
I had the same problem. Tried rebuilding Mail mailboxes, re setting preferences and so on to no avail. Then rebuilt and repaired whole hard drive with DiskWarrior 5. So far no further problems. Perhaps a coincidence, perhaps a solution but I pass it on for what it is worth.