"failure notice" Remote host said: 550 5.1.1

Apreciados señores, ultimamente algunos mensajes de correo electronico no
son devueltos con el siguiente mensaje:

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 5.1.1 <dirección correo> recipient rejected (state
14).

Tambien con otros servidores

Remote host said: 550 5.1.1 <dirección de correo> recipient rejected
[RCPT_TO]

Below this line is a copy of the message.

Received: from [217.146.XXX.XXX] by n9.bullet.ukl.yahoo.com with NNFMP; 14
Jan 2009 17:40:28 -0000
Received: from [87.XXX.XXX 50] by t5.bullet.ukl.yahoo.com with NNFMP; 14 Jan
2009 17:40:28 -0000
Received: from [127.0.0.1] by omp207.mail.ukl.yahoo.com with NNFMP; 14 Jan
2009 17:40:28 -0000

Lo he probado de diferentes cuentas y servidores pero el resultado es el
mismo.
Agradecería cualquier sugerencia o indicación para solucionar, o siquiera
entender, el problema

Saludos