Our company is in a similar situation. We're currently looking into http://www.port25.com/ http://www.port25.com/ (a software solution for $x,xxx) and http://w

Our company is in a similar situation. We're currently looking into http://www.port25.com/ http://www.port25.com/ (a software solution for $x,xxx) and http://www.strongmail.com/ http://www.strongmail.com/ (a hardware/software solution for $xx,xxx).