procedure TForm1.Button1Click(Sender: TObject);
begin 
  NMSMTP1.Host   := 'mail.host.com'; 
  NMSMTP1.UserID := 'Username'; 
  NMSMTP1.Connect; 
  NMSMTP1.PostMessage.FromAddress       := 'your_mail@host.com';
  NMSMTP1.PostMessage.ToAddress.Text    := 'delphiworld@mail.ru';
  NMSMTP1.PostMessage.ToCarbonCopy.Text := 'your_mail@host.com';
  NMSMTP1.PostMessage.ToBlindCarbonCopy.Text := 'second_your_mail@host.com';
  NMSMTP1.PostMessage.Body.Text         := 'This is the message from Delphi World project';
  NMSMTP1.PostMessage.Attachments.Text  := 'c:\File.txt';
  NMSMTP1.PostMessage.Subject           := 'Delphi World is Great!';
  NMSMTP1.SendMail;
  ShowMessage('Mail sent !');
  NMSMTP1.Disconnect;
end;