[ubuntu-ar] Rebotan los correos

[Maykel Franco Hernández]

Hola muy buenas, tengo un servidor de correo atmail montado en
ubuntu-server y este correo a la dirección estipulada me los rebota, dejo
el correo y el error:

De: Mail Delivery System [mailto:Mailer-Daemon en ceymsa-mail.ceymsa.es]
Enviado el: jueves, 18 de febrero de 2010 18:23
Para: cmoreno en ceymsa.es
Asunto: Warning: message 1Nh1bq-0000cV-I3 delayed 72 hours

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 72 hours on the queue on ceymsa-mail.ceymsa.es.

The message identifier is:     1Nh1bq-0000cV-I3
The subject of the message is:
=?iso-8859-1?Q?Enviando_por_correo_electr=F3nico:_SOLICITUD_RMA.xls?=
The date of the message is:    Mon, 15 Feb 2010 15:05:21 +0100

The address to which the message has not yet been delivered is:

   sissl en xn--telefnica-96a.net

 No action is required on your part. Delivery attempts will continue for
 some time, and this warning may be repeated at intervals if the message
 remains undelivered. Eventually the mail delivery software will give up,
 and when that happens, the message will be returned to you.




Desde otros servidores de correo si me deja enviarlos. Puede ser por la
cabecera del mensaje que no le guste al servidor de correo destino?? Un
saludo.