DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA

[Mail System Internal Data <MAILER-DAEMON@mirage.irdu.nus.sg>]

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.