Problena En el envio de un correo

[Piradoxlanieve]

Hola estamos intentando enviar un correo a una cuenta pero nunca llega, desde el servidor montado en ispcp si se envia desde gmail o hotmail si lo reciben.

Quote:Subject: Undelivered Mail Returned to Sender


> This is the mail system at host ksxxxxxx.kimsufi.com.
>
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
>
> For further assistance, please send mail to postmaster.
>
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
>
> The mail system
>
> <xxx@xxxx.es>: host mail2.xxxx.es[xx.xxx.xxx.xxx] said: 550 Administrative
> prohibition (in reply to end of DATA command)

Eso es lo que recibo desde la cuenta que se envia.

Alguna idea?