[postfix-es] problemas con hotmail

[deconya]

Buenas

Hace un tiempo me encontre con que hotmail declaraba spam mi servidor. Hice
algunas averiguaciones y encontre bastante gente afectada. El caso es que
ahora aparece mi IP como correcta usando la web

https://postmaster.live.com/snds/addnetwork.aspx

Pero incluso rellenando el formulario:

https://support.msn.com/eform.aspx?productKey=senderid&ct=eformts

Me sigue devolviendo los mails. El mensaje que da es:

This is the ESMTP Server program at host correo.lmtp.tiservinet.es.

I'm sorry to have to inform you that your message could not be
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 ESMTP Server program

<xxxxxxxxxxxx en hotmail.com>: host mx1.hotmail.com[65.54.245.8] said: 550
    SC-001 Mail rejected by Windows Live Hotmail for policy reasons. Reasons
    for rejection may be related to content with spam-like characteristics or
    IP/domain reputation problems. If you are not an email/network admin please
    contact your E-mail/Internet Service Provider for help. Email/network
    admins, please visit http://postmaster.live.com for email delivery
    information and support (in reply to MAIL FROM command)

Lo peor es que encima me lo envia en funcion del momento desde distintos
servidores mx. Alguien mas le ha pasado y tiene idea de que se puede hacer
(aparte de recomendar el cambio de proveedor)?

Un Saludo
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