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i just moved my Mails to another server. 
Unfortunately the server set the timestamp of all mails to the current time.

After searching for a solution for about a week, i finally tumbled over [http://www.gabrielserafini.com/archives/2006/12/18/fixing-mailapps-imap-date-problem-mostlygeek/ this Website].

There is a script to be run on the maildir to change the timestamp to the mailheaders date.
I'm using ISPCONFIG , so the directory to the mails is /var/vmail.
After running the script , you should delete courierimapuiddb in the corresonding directory. It will be rebuilt the next time the user logs in.

Now all mails have the correct date again ;-)