IMAP - email received dates

[stuorguk]

I have just completed updating my third computer to Gentoo. This used to be a Mandrake server I run at home, running Postfix and uw-imap.

I decided to switch to using courier-imap while I was at it. My e-mails were stored in the indexed mbx format, and I couldn't find a suitable converter, so I just downloaded all my mails into my e-mail client, and uploaded them all back after the update. Unfortunatly, this has reset all my e-mail "Received" times to the time I copied them.

Any solution to this? Script to set the time from the email header maybe?