Suddenly our public IP address is being blocked by RATS-Dyna. I looked it up with MXTools blacklist lookup and they are the only ones complaining. When I do a lookup at RATS-Dyna website and ask to be removed I get this message "The IP address you have specified does not comply with best practices. Currently, the reverse DNS for this IP address is: static-71-254-189-37.lsanca.fios.verizon.net." We have had it set this way for years and nobody has complained. The funny thing is that our email is flowing fine and nothing is being blocked to our knowledge. We found there was a problem when we try to go to the web site USPS.com and all workstations are blocked. I have dealt with reverse DNS to some degree before and I thought it was only related to email. We are running an old SBS 2003 that we are about to replace in a couple of months. Is there a quick fix for this in the meantime?