From MAILER-DAEMON Wed Jan 26 00:00:00 2006
Date: 26 Jan 2006 00:00:01 +0100
From: Mail System Internal Data <MAILER-DAEMON@k4>
Subject: DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA
X-IMAP: 1111111111 0000000000

This text is part of the internal format of your mail folder, and is not
a real message.  It is created automatically by the mail system software.
If deleted, important folder data will be lost, and it will be re-created
with the data reset to initial values.