customizing bounce messages from sendmail

hello,

how do i create a more descriptive bounce message to replace sendmail's
cryptic messages? i wonder if that could be done with procmail...

-- 
francis vidal   university of st. la salle, bacolod city, philippines
. . . . . . .   PGP key available via e-mail / subject: get PGP key
u s l s N E T   tel. nos. (6334).435.2324 / 433.3526