cyrus: delete previously deleted messages(after backup recovery)

[Y B]

Hello,

after a disk crash, I had to recover all the emails from a daily backup.
Unfortunately, I noticed that this backup was made with the rsync command
but WITHOUT the --delete options.
That means that the mail backup was much larger than the original one since
no message was ever deleted on the backup.
Now I would like to clean the mailboxes and remove all those emails that
were previously deleted but I cannot find how.
Is there any easy way to do this?
(I use cyrus+postfix on debian 6.0.4)

Thank you for your help.

Yannick
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