NOTE

       After you have made changes to your mailbox filter file, it
       is important for you to verify that it is working correctly,
       especially if you have edited it manually. If your filter
       file is not working, for example if it has a syntax error,
       your mail delivery could be interrupted.

    The easiest way to check your mailbox filter file is to send
    yourself mail. If your mail gets to your mailbox successfully,
    then there is nothing wrong with your filter file.

    Your filter file can also be verified by your system
    administrator using the command:

    $ pmdf test/rewrite/filter <your-mailbox>