Hi. We have several devices on our network that need to send email alerts during the day. For example, our SonicWall alerts me when an anomaly is detected. Our ComCast business class SMTP server allows us to relay the message only if we provide credentials. SonicWall allows us to supply those credentials and it works great. We also have an APC Netbotz that is not smart enough to supply credentials, so ComCast SMTP will not allow it to relay. We do not have access to an Exchange server locally, so I want to download or write a simple .NET app that will listen for an SMTP request and run on my development PC. I know how to write the C# or VB.NET code to send email, including how to authenticate, etc., but i do not know how to have an app listen for email requests and relay them to the ComCast server. Any ideas? PS I would prefer to download a free or low cost desktop SMTP server but cannot find one.