Hi All, I want to ask you people speciall Mark Fugatt that what do you have opinion about Reverse DNS lookup option in exchange 2000. As i have enabled this option last week to check the ratio of spams. I found good results but recieved calls from diffrent companies that they can't send us emails and their revers dns lookup entry is not yet setup with their ISP. So, I have to disabled it again. What you people have advice for it. Any help will be appreciateable. Thanks Basit