Does anyone who runs their own mailserver ever have issues with this blacklist? My server ended up on their blacklist, I email them to ask why and to be removed. They remove me but provide no information then a few weeks later I get another alert from MX Toolbox to say I am once again on the blacklist so I email them again and they remove me again but again they ignore my request for the reason and so the cycle continues. I check the security of the server and the logs on an almost daily basis and can see no malacious activity. The only reason I can possibly think of is maybe because the server is on an ADSL connection but even that is no excuse for them, the server is correctly configured with reverse DNS etc.