Verizon's 3rd party spam detector is terrible. On quite a few occasions I have had e-mails bounce back to me because they are identified as "spam." These e-mails are often replies or forwards to clients, often of a time sensitive nature; there is nothing in them that could possibly be interpreted as spam. They are single e-mails sent to single recipients. I've found that forwarding them to the spamdetector.update@verizon.net is absolutely useless. I've never received a reply or confirmation, and have never had the problem resolved. Once my current service contract runs out, I am switching to a different service provider.