Fraud and Phishing detection

[DAve]

I have looked through the wiki and the website. I found 
http://www.mailscanner.info/support.html#phishing but nothing more.

Can anyone tell the rules/logic used for detecting Fraud and Phishing 
attempts in a message? Or is this a read the source moment?

Thanks,

DAve
-- 
Three years now I've asked Google why they don't have a
logo change for Memorial Day. Why do they choose to do logos
for other non-international holidays, but nothing for
Veterans?

Maybe they forgot who made that choice possible.