I have Xeams setup on Ubuntu 12.04 as an internal proxy for my DVR to email my Exchange 2010 server ( this is because Exchange for some reason rejects email from the DVR ) and it works great. So I tried to setup Xeams as a proxy on a Windows 7 64 bit machine to communicate with Exchange ( I created a separate SMTP connector in Exchange for it ), I copied the configuration from the working Ubuntu setup to the windows setup, I have checked and double checked the configuration of both setups and they are identical apart from the local IP to bind to. Any ideas