控件
 smtp: TIdSMTP;
 MgeSend: TIdMessage;
代码
procedure TForm1.Button1Click(Sender: TObject);
begin
  SMTP.Host:='smtp.163.com';
  smtp.Username:='[email][email protected][/email]';
  smtp.Password:='paswrd';
  smtp.Port:=25;
  smtp.Connect();
  MgeSend.Recipients.EMailAddresses:='[email][email protected][/email]';
  MgeSend.From.Text :='[email][email protected][/email]';
  MgeSend.Subject:='test';
  MgeSend.Body.Text:='发邮件测试';
  SMTP.Authenticate;
  Smtp.Send(mgeSend);
end;