Hi All, I have just been listed on SBL. http://www.spamhaus.org/SBL/sbl.lasso?query=SBL42009 This domain has never been on my server. However, this domain has its' NS1 and NS2 pointed to my server! What can I do about this? How do I prevent my IP from being logged as a spammer in such a way? I don't know what to do against something like that. If you look at the link provided, you will a return path that is not of my IP (at least that is my understanding of this link). My IP is is: 18.104.22.168 and it is blacklisted now. I could use help on this issue. Would SPF do anything to prevent this? thanks, -Alon.