Cita: Can I use CDONTS?
CDONTS will not work on our servers because it requires the web server to be running SMTP, and we do not run mail services on our web servers, only on our mail servers. This is done for both performance and security reasons.
Tendras que cambiarte de host (o pagar 9 dolares al mes), en las respuestas anteriores hay algunos buenos aportes.