ScamAssassin: marry Snopes to a mail-filter

LazyWeb is Matt Jones's coinage that describes the process whereby one throws out an idea in the hopes that someone else will build it. Here's my LazyWeb idea; I call it "ScamAssassin." The idea is to build an email filter (maybe a SpamAssassin module?) that identifies email that contains a hoax or scam that can be found on Snopes or Purportal and pastes in a warning at the top of the message, so:

FROM: BARRISTER AKINI ABBEY
OKEAYA INNEH LAW FIRM
ATTORNEYS/LEGAL PRACTITIONERS.
NIGERIA

ATTENTION: XXXXXXXXXX
DEAR SIR/MADAM,

COMPLIMENTS OF THE SEASON. GRACE AND PEACE AND LOVE FROM THIS PART OF THE ATLANTIC TO YOU. I HOPE MY LETTER DOES NOT CAUSE YOU TOO MUCH EMBARRASSMENT AS I WRITE TO YOU IN GOOD FAITH BASED ON THE CONTACT ADDRESS GIVEN TO ME BY A FRIEND WHO WORKS AT THE NIGERIAN EMBASSYIN YOUR COUNTRY. PLEASE EXCUSE MY INTRUSION INTO YOUR PRIVATE LIFE.

becomes:

This note appears to be a "419" or "Nigerian letter" scam. See http://www.snopes.com/inboxer/scams/nigeria.htm for more

FROM: BARRISTER AKINI ABBEY
OKEAYA INNEH LAW FIRM
ATTORNEYS/LEGAL PRACTITIONERS.
NIGERIA

ATTENTION: XXXXXXXXXX
DEAR SIR/MADAM,

COMPLIMENTS OF THE SEASON. GRACE AND PEACE AND LOVE FROM THIS PART OF THE ATLANTIC TO YOU. I HOPE MY LETTER DOES NOT CAUSE YOU TOO MUCH EMBARRASSMENT AS I WRITE TO YOU IN GOOD FAITH BASED ON THE CONTACT ADDRESS GIVEN TO ME BY A FRIEND WHO WORKS AT THE NIGERIAN EMBASSYIN YOUR COUNTRY. PLEASE EXCUSE MY INTRUSION INTO YOUR PRIVATE LIFE.

Someone, build this thing! Discuss