I found a command in the forums for rebuilding the virtusertable called postmap. This has fixed the incoming mail issue, but once I logged into the web interface, the recycle bin is still not empty.
It seems the issues I have run into most are the virtusertable becoming corrupt and the recycle bin not emptying. Last week I audited the user accounts and aliases using the web interface and deleted two accounts. None of my changes took effect until I forced the update using postmap and the recycle bin still will not empty the deleted accounts.
Am I missing something?