smtp;550 DY-001 Mail rejected by Windows Live Hotmail for policy reasons

Hi,
I've an SBS 2003 server hosting a few domains, for example domain1.co.uk, domain2.co.uk and domain3.co.uk.  Domain1 is the primary domain for SBS, domain2 and domain3 are primary to different users.  Over the past few days I'm experiencing issues sending emails to MSN.COM addresses, please refer to the detail below, some parts altered for obvious reasons.

Your message did not reach some or all of the intended recipients.
      Subject:  Test
      Sent:     30/01/2008 22:54
The following recipient(s) cannot be reached:
      exampleuser@msn.com on 30/01/2008 22:54
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <domain1.co.uk #5.5.0 smtp;550 DY-001 Mail rejected by Windows Live Hotmail for policy reasons. We generally do not accept email from dynamic IP's as they are not typically used to deliver unauthenticated SMTP e-mail to an Internet mail server. http://www.spamhaus.org maintains lists of dynamic and residential IP addresses. 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>

Any idea's for 500 points, urgently required :-)
wayneinukAsked:
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mass2612Commented:
Hi,

Have you checked your IP address in the http://www.spamhaus.org database. It sounds like you are using a dynamic IP from your ISP rather than a static IP address and that this address or address range my be on the database that the recipient end is using for their SBL.

You can use http://www.whatsmyip.org/ from your server to find it if you are not sure.
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wayneinukAuthor Commented:
Hi mass2612,

I'm using static IP and I've checked the IP address and range against spamhaus and it is not listed.  My ISP is BT Internet and I've had the service with the same IP's for 2 years or so.  I've several implementations of SBS set-up the same with no apparent issues, really strange.
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wayneinukAuthor Commented:
Hi mass2612,
You were right, I'd replaced the Cisco router and not set a static IP on the dialer and as a result the router was picking up a dynamic IP address.  All sorted, thanks for your help, was having a bad day :-)
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