DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA

[Mail System Internal Data]

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This message is no problem as it is not seen when accessing the email via IMP.  
But when then the box is emptied with a POP3 email client this message is 
downloaded.  I know this may be a IMAP issue, but if anyone knows of fixes 
around this message, and even could give me the reason for the existence of 
this message (ie. in my system it seems to benefit anything..) greatly 
appreciated.

thanks,
tim.