We are having our emails to hotmail and live mail blocked with with the following response.  This began to happen Wednesday morning GMT.  We sent a circular to our member-base the evening before, so this may be related.

Previously, we have had no issues delivering to Hotmail/Live, our SPF records are correct and we have unsubscribe links on our outbound newsletter.

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Reporting-MTA: dns; gate1.bullionvault.com
X-Postfix-Queue-ID: 2F48EC03BF
X-Postfix-Sender: rfc822; {removed email address}
Arrival-Date: Wed,  3 Jun 2009 10:00:05 +0000 (UTC)

Final-Recipient: rfc822; {removed email address}
Original-Recipient: rfc822;{removed email address}
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx4.hotmail.com
Diagnostic-Code: smtp; 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

Gold People, it appears that your domain is being affected by one of our anti-spam or bulk message filters. I can’t resolve this for you immediately so I’ve escalated your concern to the Windows Live Hotmail Sender Support Team. They work directly with senders and domains. It may take a few days for the team to resolve this issue that’s why your patience is really important.

Thank you for escalating this.

We probably hold at least $5-10m of bullion for hotmail users, so sooner is better!

@ Gold People
Let's hope.  It would actually depend on the communication done between the Windows Live Hotmail Senders Support Team and the e-mail administrator of your e-mail provider.  They will be working hand-in hand in resolving this issue.

Thanks!