aspNetEmail component relay problem

I need to be send error messages to myself (webmaster) for this website via aspNetEmail under ASP.NET 1.1

I keep getting error 550 5.7.1 Unable to relay for [email protected] ] Verify you can send email on behalf of '[email protected]'

I've tried using the Username and Password options to no avail.
I've also tried using localhost to test it from my PC without success.

Code follows:

try
{
aspNetEmail.EmailMessage mail = new aspNetEmail.EmailMessage();
mail.To = '[email protected]';
mail.From = EmailFrom.Text;
mail.Subject = 'Inquiry from ' + MsgFrom.Text;
mail.Body = MsgToRSVP.Text;
mail.Server = 'mail.rsvppllc.com';
mail.BodyFormat = aspNetEmail.MailFormat.Html;
mail.Send();
}
catch(Exception ex )
{
aspNetEmail.EmailMessage ErrorMsg = new aspNetEmail.EmailMessage(true, false);
ErrorMsg.To = '[email protected]';
ErrorMsg.FromAddress = '[email protected]';
ErrorMsg.From = 'Error on Contact_RSVP';
ErrorMsg.Subject = 'Error during send of RSVP Contact page';
/// ErrorMsg.Server = 'mail.rsvppllc.com';
ErrorMsg.Server = 'localhost';
ErrorMsg.FormatException( aspNetEmail.MailFormat.Html, ex, true, true, aspNetEmail.ServerErrorSection.All);
}

Post Edited (nfavery) : 11/23/2005 3:52:49 PM GMT

 

I've uploaded my page and changed the assembly to point to the 3.0.0.0 version.
I've changed the e-mail server to point to 'localhost'
Now, when I click Submit, nothing happens. The mail is not sent, nor is the error e-mail sent.

Shoule the appSettings be
<add key='aspNetEmail.EmailMessage.Server' value='localhost'/>
or <add key='aspNetEmail.EmailMessage.Server' value='mail.sitename.com'/>