Ignoring junk mail

Hi,

I’ve received a lot of junk mail at my RT queues, so I’d like to prevent it.
Is
possible to reject messages when the To: field do not match my queue’s
e-mail addresses ? Any other ideas ?

My config: Conectiva Linux 6.0, Sendmail with majordomo wrapper, RT 2.0.13

TIA,

Presciliano