A lot of times spammers have a From that not match for example this is a from of a spam :
From: "Electric Service" <developer@faubelonweb.de>
You see that description Electric Service is not matched in developer@faubelonweb.de
Il will be useful a Regular Expression that find a partial match of 3 or 4 char to match for example :
From: "Electric Service" <developer@electricservice.de>
And give a negative score if not match
I am not able to do this, are you ?