crossposted messages

Snark (
Fri, 20 Jun 1997 10:35:08 +0300 (EET DST)

if an article has been crossposted in several newsgroups and i am
subscribed only to few of them, ifmail will generate a .pkt for each of
those newsgroups: i.e., if a message is crosposted to alt.tralala and
rec.blablabla and i am not subscribed to rec.blablabla, i will receive a
.pkt for rec.blablabla, too. how do i avoid this?