[Dovecot] About the Dovecot Missing mail.

Dear Sir and/or Madam,

I'm the newbie for using Linux, and now our company find the freelancer to change the mbox to maildir. we found that we have mail loss with error massage(ERROR: Connection dropped by IMAP server.

Query: EXPUNGE), after that our freelancer do something to let this massage disappear. But now will still found we have mail loss. What can I do? I found a similar case in this page, but I can't found the solution, anyone can help me?

URL: http://www.dovecot.org/list/dovecot/2011-December/062632.html

Best Regards,

Vilson Lai