Lo he vuelto a intentar y este es el mensaje que me devuelve. A ver si encuentra alguna solución.

Luis

Delivery to the following recipient failed permanently:

mary_14gv@hotmail. com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Requested action not taken:...

Le voy a dar entonces otra dirección: maryluzgv@gmail. com, muchas gracias