By Jim Clay on 3/27/2008 7:57 AMIf you are in busines, DON"T use these spam filter services that force the sender to click on a link in the response email, put in some info and then you email will go through. I consider these COMPLETELY unprofessional. I can't believe businesses are buying into them. If you need spam filtering use something that the sender doesn't have to deal with. At our office we have spam software that works with our Exchange server. Catches probably 95+% of our spam. Through my hosting business, for those who use my hosted email, there is some basic spam filtering in there, but I also offer an add-on that puts your email through a Barracuda spam filter appliance. These things work great and the cost is worth it.