Microsoft's Terry Zink announced yesterday on the Mailop list that Microsoft is combining the infrastructure for Outlook.com (Hotmail) and Office 365. As part of this infrastructure update, Microsoft is letting the world know that soon, all outlook.com (hotmail.*, live.*, msn.*, etc.) consumer email traffic will originate from IP addresses in the 40.92.0.0/14 (40.92.0.0 - 40.95.255.255) network range. Folks running spam filters will want to update their systems accordingly.
Yep, Hotmail does indeed use the Spamhaus SBL as part of their spam filtering and blocking system. I received a report yesterday of this specific SMTP error response received: "550 OU-001: Mail rejected by Hotmail for policy reasons. If you are not an email/network admin please contact your Email/Internet Service Provider for help.mail clients
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