Working with a digest

I receive a couple of digests, and would like to split them, make sure
they have the correct reply-to address, and then gzip the resulting
messages for reading at some later date

Would something like this work?

:0
*^From.*digest
{
        :0
        |formail +1 -ds

        :0fwh
        |formail -I"Reply-to: list moderator"

        :0
        |gzip -fc >> digest.gz
}

TIA
--
Collaboration, n.:
        A literary partnership based on the false assumption that the
        other fellow can spell.