I used imapsync to transfer 15 Gigs mailbox accounts to my new mail server yesterday.

I realised that i made big mistake by forgot using --syncinternaldates option, it seems that the "Received Date" in the mail listbox (conversation view / message view) all show the date the mails were imported into the system.

Is there any way to re-run imapsync and overwriting all the same destination mails without deleting all email first and running imapsync again?

Any help will be appreciated. Thanks.