>Frank
>I'm using VS 2010.
>
>Here are the references:
>
>
>using System.Data;
>using System;
>using System.Diagnostics;
>using System.Net.Mail;
>using System.Net;
>using System.Configuration;
>using System.Drawing;
>using System.Data.SqlClient;
>using System.Web;
>using System.Web.UI;
>using System.Web.UI.WebControls;

hmm, I guess the one that matters is System.Net.Mail, but I have that already. I'm targeting .net 3.5, maybe that's a difference? I also have googled and can't find any references to a built in SMTPMailer in .NET. Maybe you have this defined in code somewhere? If you right click on SMTPMailer do you have an option to "go to definition"?