D4 Pro NMSMTP Question

I am writing an application where business clients will connect to their preferred ISP using anything from Cable, DSL, T1, dial-up to AOL, or calling their local Mom-and-Pop ISP for internet access, and send a series of emails generated from database reports.  (No, this isn't a spam-generator!)

The NMSMTP control in Delphi 4 Pro looked like the solution, except it connects and immediately disconnects from my ISP.    A code sample from a simplified test project follows:

procedure TForm1.Button1Click(Sender: TObject);
begin
  NMSMTP1.Host := Edit5.Text;
  NMSMTP1.Port := StrToInt(Edit6.Text);
  Memo1.Lines := NMSMTP1.WSAInfo; //Show me what's happening during testing
  NMSMTP1.UserID := Edit6.Text;
  NMSMTP1.Connect;
  NMSMTP1.PostMessage.FromAddress := Edit1.Text;
  NMSMTP1.PostMessage.ToAddress.Add(Edit2.Text);
  NMSMTP1.PostMessage.Body.Add(Edit4.Text);
  NMSMTP1.PostMessage.Subject := Edit3.Text;
  //NMSMTP1.PostMessage.LocalProgram := 'NMSMTP Demo';
  NMSMTP1.SendMail;
  NMSMTP1.Disconnect;
end;
The mail server for the ISP I use for testing is on a Linux box running sendmail as the Message Transfer Agent (MTA).  I suspect a password is required that matches the user name.  I can't find a password property for this control.  If that is the problem, how do I send one?  Leaving the UserID property blank did not work, either.
Any comments on getting this to work with AOL after I get it to work with everyone else would also be helpful.  Thanks!