You specified a web page as the SmtpServer. You need to provide the address to the SMTP server. - Nick Parker My Blog | My Articles

I posted it as a direct reply to the parent thread. .config files are best to target, although writing to them can be dangerous if you don't take errors into account. The registry is an option, but is not recommended because of deployment issues, such as XCOPY deployment. Microsoft MVP, Visual C# My Articles

You have to add a reference to the DLL. Therefor go to the solution explorer, right-click on References and select "Add Reference". In the dialog that opens, search System.Web.dll entry in the ".NET" tabpage, double-click on it and close the dialog with OK. www.troschuetz.de

In addition to what Nick said, you don't need to tell the ASP.NET application what your IP address is. It already knows. From with your page or control, just call Page.Request.ServerVariables["SERVER_NAME"]. This gets the hostname or IP address. There's other ways to get this, too, like Page.Request.Url.Host. If you like, the best place to store this would be in the Page.Application property - kind of like a session variables only they apply to the whole application so that the application can query the variables (like Page.Application["IPAddress"]) and get the same thing everywhere. Microsoft MVP, Visual C# My Articles