SMTP email problems

The following line of code :
SmtpMail.Send(objEmail)

Produces this error :
"System.Runtime.InteropServices.COMException: Unspecified error"

Can anyone help ?

I have included "Imports System.Web.Mail" at the top of my code behind page and intelisence reveals all appropriate properties and methods.

Are you using any kind of OCX or DLL to interop. with the current proj or you just use the .NET class ? Maybe you need to show more code !