How to block the bat!

[cpayne]

Guys,

I am getting a lot mail which I know is from a mail program use by 
spammers,  called the bat.

I like to know how can I write a rule to give lets say two or three 
points for this in the header.

X-Mailer: The Bat! (v2.00.6) Educational

Thanks for any help you can give me. 

Payne