This software is worse than the spam it fights. I am a shareware author and I send out email messages to my registered users to notify them when a new version is released. In response to this service, I find a pile of returned mail in my inbox which not only requires me to send *another* email in order to have my message sent, but threatens to permanently blacklist me if I take no action! So what am I to do? Waste my time writing these reply emails (and sometimes even having to enter the text that appears in an embedded image in their bounce message) or ignore them and have to live with the fact that my email address will then be permanently blacklist and if my customers ever write in to me with support queries my replies to them will be instantly discarded. I couldn't be more opposed to the basic design premise of this software. It shifts the inconvenience of spam onto innocent, legitimate users. It presumes guilty until proven innocent. Spammers don't care about getting blocked, but I, as a legitimate correspondent do. This software has got it all wrong.