"LISTSERV list owners' forum" <[log in to unmask]> wrote on 
06/24/2006 01:52:00 PM:

> One of my subscribers has contacted me to say that he is no longer 
> receiving list messages. I have checked is his subscription and 
> everything is as it should be. His email address is a school based 
> one and his network administrator contacted me to say that list mail
> was being filtered out by their spam filter (McAfee). They say they 
> are not able to control this since Listserv continually changes its 
> IP address. Is this correct?
> 
> To be truthful I not very familiar with spam filters. I wondered if 
> anyone had experienced a similar problem with one of their lists or 
> could offer any advice. 

It would seem the mail admin is full of canned meat product.  Listserv 
does not change it's IP address, unless the machine it is on (actually, 
the machine that relays the email) used a dynamic address via DHCP, but 
that would just be A BAD IDEA.

Who hosts the list? Have you talked to the site manager?

Most spam filters (I can't speak specifically for McAfee's) allow you to 
whitelist by domain, which should not care about the IP address anyways. 
Hopefully he is whitelisting the domain of the listserv, not the person 
sending the email.  In the case of this list, whitelist the domain 
peach.ease.lsoft.com. 

I spend most of my working day running spam filters, and I can honestly 
say they are making email far less reliable.  They also provide a great 
excuse...  "I'm sorry, the spam filter must have eaten it."