sions, the return value was N/A.  Therefore,
    if you use either of these callbacks, and the return value of your
    routines evaluates to false for a given message, the message will
    be excluded from the archive.
    </p>
    <p>If you never want to exclude messages with either of these callbacks,
    have your routines always return <tt>1</tt>.
    </p>
    <table class="note" width="100%">
    <tr valign="baseline">
    <td><strong>NOTE:</strong></td>
    <td width="100%"><p>The example <tt>mha-pre