Sort existing mailbox into YEAR-MONTH

I use the recipe from the Procmail manual to sort into dates:

:0:
$MAILDIR/foo/`date +%Y-%m`

...to put mail into:

        $MAILDIR/foo/2003-02
        $MAILDIR/foo/2003-03
        $MAILDIR/foo/2003-04

...etc.,

I have a large mail file from before I started using this method. Is there a
way of sorting that mail file into the date (YYYY-MM) that the mail arrived?

I tried doing this with formail:

        #!/bin/sh
        formail -s procmail -m datehandler.rc < BIGFILE

<datehandler.rc>
        :0B
        `date +%Y-%m`

...but of course that just makes one file with today's date.

Not quite sure how to do this one; any help much appreciated.

Thank you
David






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