Losing headers.

Deja vu - or amnesia.  I thought I asked this before, but I don't remember
the answer, and I don't see it in the archives.

How do I make the following recipe NOT delete headers from the
message--especially Received headers?

# Send bounced mail and mail from admin accounts to its own folder
:0:
* (^FROM_MAILER|\
   ^From.*[^0-9A-Za-z]abuse@|\
   ^From.*[^0-9a-zA-Z]spam@)
| formail -Y -A"X-procmail: Admin" >>$BULKFOLDER