ASP.NET - enviar email sin la ayuda de smtp server

enviar email sin la ayuda de smtp server

tengo esto pero es en c# y no lo entiendo,
ademas creo que tengo que bajar algo
private void SendEmail()
{
OBJClass oSmtp = new OBJClass();
//If you don't have a SMTP server, use the following code
//send email via DNS lookup, ANSMTP lookups SMTP server automatically.
oSmtp.ServerAddr = "";

oSmtp.FromAddr = "[email protected]";
oSmtp.AddRecipient( "Support Team", "[email protected]", 0 );

oSmtp.Subject = "Test";
oSmtp.BodyText = "Hello, this is a test....";

if( oSmtp.SendMail() == 0 )
Console.WriteLine( "Message delivered!" );
else
Console.WriteLine( oSmtp.GetLastErrDescription());
}