Almost two years ago I have posted a comment regarding Blacklist providers that I use and I trust… Well I would like to update this post by adding or commenting that now I use only two providers that sucessfuly eliminate or reduce spam that is coming to my mail servers …

I currently use:
zen.spamhaus.org provided by http://www.spamhaus.org
bl.spamcop.net provided by http://www.spamcop.net

As you should decide to use or not to use blocklist providers on your mail servers I am adding interesting article from august 2009 to better understand how this providers work: http://www.allspammedup.com/2009/08/understanding-blocklist-providers/

I wish you luck in fighting spam! 🙂