How do you people handle spam from Google lists etc?

[George Papamichelakis]

Hi all ,


I'm sure I'm not the only one  here that gets spammed from google 
servers , I receive

messages that in from line apears something like this :

azovwave+bncbd3orshfrylbb36yx3sqkgqegq7g4ga at googlegroups.com
azovwave+bncbd3orshfrylbbiwjqxsakgqev4lqfzy at googlegroups.com
azovwave2+bncbd3orshfrylbbno2x3sqkgqei4erkja at googlegroups.com
azovwave12+bncbd3orshfrylbbuwzx3sqkgqeecgxwwi at googlegroups.com


the address of course is different or changes every now and then, as you 
can see in the first pair

and the only common clue  I can find, is in the headers  which is the 
only reference to the real spammer :

X-Original-Sender: arwad at azovwave.com


A rule from inside mailscanner seems impossible to catch such spammers , 
so how do you

people get by from these without blocking google email servers ? you 
work your way in local spamassassin rules ?

is there some thing  in the setup of mailscanner that I have overlooked ?


Thanks in advance