I've looked for several days on this issue but found nothing similar.

I have my AIM email set up on my ATT pre plus. It's IMAP and from what I can tell from other threads, my setup is correct. What I am noticing are duplicate messages only in the Trash folder, which return after emptying ( Only a few days worth though). I have deleted and readded the account several times. Wasn't always like this. Any thoughts? Thanks in advance.