[SAtalk] reject messages

[gentian]

I am a baby to spamassassin and before I start getting my hands dirty on it I am still collecting information about it. No Spam Today for windows (which implements spamassassin engine) has an option that rejects the emails tagged as spam, so it tells the sender that the email was never received and you may add a subject that tells the sender to send another email to your a administrator address somewhere else where it can be received and if it is a false positive the sender will reply back so you can add his address manually to white list.   Is such a thing possible with SpamAssassin and some other combinations in Redhat ??   Thanx in advance