I personally handle lists using the ListID: header that is almost universal 
now. These are typical:

>To: [email protected]
>Subject: Re: Only way to stop the sex and drug SPAM?
>Reply-To: [email protected]
>List-ID: <g3-5-list.googlegroups.com>


My list address is filtered using a white list of subscribed  ListID: headers. 
Not there, the message is spam.

There are a few exceptions and I do look for a subject that is an exact 
duplicate of something I have recently sent. That helps for folks who still 
think replies to lists ought to be sent To: the poster with a copy to the list. 
(That was a good idea when lists could take more than a day to respond over a 
telephone or usenet connection.)

If you speak perl have a look at: 
<ftp://ftp.macnauchtan.com/Pair/qfilter_list.pl>

The list server is usually pretty good at filtering out spam sent to the list 
for re-distribution. They have the advantage of an allowed list of posters who 
can be cut off for bad messages. But it can still happen that a subscriber's 
computer can get infected and distribute messages over a list, Such things are 
usually  detected and stopped quickly.

-- 

--> The U. S. Census Bureau missed a bet by not counting all of those embryos 
in cold storage. <--

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