[Q]: munging digests

The problem:

    I'm subscribed to a few mailing lists that send me mail digests.
The embedded messages don't have "To:" or "Cc:" headers, and
occasionally some of them are spam (yes, the Procmail list is not very
original in this respect ;-)). So basically I'd like to do three kinds
of things:

(1) Split the digests into separate messages;
(2) Distribute the "To:" line of the digests to the embedded messages;
(3) Run the resulting messages through Procmail again to remove spam.


My attempted solution:

    I can easily get (1)+(2):

:0
* ^From.*Digestifier
{
  :0 hw
  SAVE_TO=|formail -x To:

  :0:
  |formail +1 -eds formail -a "To:$SAVE_TO" >>mailbox
}


    I can also get (1)+(3):

:0:
* ^From.*Digestifier
|formail +1 -eds procmail -m $MAILDIR/.killfile >>mailbox


    But I can't seem to get (1)+(2)+(3).  The obvious approach

:0
* ^From.*Digestifier
{
  :0 hw
  SAVE_TO=|formail -x To:

  :0:
  |formail +1 -eds formail -a "To:$SAVE_TO" | procmail -m 
$MAILDIR/.killfile>>mailbox
}


doesn't seem to work: the messages either get lost without trace, or
are delivered unprocessed to my default mailbox.  Removing the "-m"
option doesn't seem to help either.  (BTW: can anybody shed some light
on the use of this option and the "parameter=value"?  The man page is
not particularly intelligible at that point).  Something is very wrong
here.  Any ideas?

    Regards,

    Liviu

-- 
Dr. Liviu Daia                   e-mail:   daia(_at_)stoilow(_dot_)imar(_dot_)ro
Institute of Mathematics         web page: http://www.imar.ro/~daia
of the Romanian Academy          PGP key:  finger 
daia(_at_)stoilow(_dot_)imar(_dot_)ro