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@ceymsa-mail.ceymsa.es] Enviado el: jueves, 18 de febrero de 2010 18:23 Para: cmoreno@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@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.