Found this post at condodomain:
http://www.condodomain.com/blog/realtors-against-realtor-spam-rars/
In my personal opinion, if you get a lot of spam, you don't have a good spam filter. No matter how many groups you start or complaints you make, spam is only going to get worse. Why, because you can make tons of money easily sending spam. Spam is now conducted by large international groups that compromise large number of computers and send millions of emails a day. 9 out of 10 emails are spam, up from 5 out of 10 only a couple years ago.
So, Get yourself a spam filter There are free ones out there and most hosting services that provide webspace provide a little tool called spamassassin. And most network admins keep it up-to-date and blocking the spam. Problem is nobody ever knows about it. All the hosting that we sell for blogs, comes with a very good control panel, called cpanel. This control panel lets you configure email, spam blockers, forwards, etc...
Here is a good free spam filter:
http://spambayes.sourceforge.net/
Just install it, and then train it. You train it by separating your good email from bad. Spambayes then figures out what you want and don't want, and then it will continually train itself as you get more spam. Just hide the folder and no more spam problem.
Now for the flipside, what happens when your emails get flagged as spam?
over the last couple weeks, my partners have been receiving my emails in their spam folders. I went to SORBS (Spam and Open-Relay Blocking System) and checked my IP number. Since I have a wireless network in my home, I had to log into my wireless router and get my "Real" IP. my real ip is used by the router to communicate to other computers on the internet and all the computers in my network get "hidden" IPs, 192.168.x.x. Anyhow, My real ip is issued from a DHCP server from Comcast. at Sorbs I enter my IP number and I get this to my surprise:

DHCP is way for an ISP to issue dynamic IPs to their customers, so your IP will change every so often. As you can see, this IP address that I'm using is flagged. I thought there was no way off this list, but a quick email to my buddy Alain, made me feel a lot better.
I thought Sorbs was the only spam blacklist, but there are more, many more. submit your IP here in their spam database and see how many spam databases your ip is in http://www.dnsstuff.com/. I also thought, Once blacklisted, you can't get off, but again I was wrong...
here are some other spam sites:
TQM-DYNAMIC (http://www.tqmcube.com/)
NOMOREFUNN (http://www.moensted.dk/spam/no-more-funn/)
DNSBLNETAUT1 (http://www.dnsbl.net.au/)
So I've requested the IP be removed from the database, and hopefully I can email my partners again.
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