When I see this behaviour from a mature microsoft product I wonder if there is not a degree of internal sabotage, such is the appearence of this foot shooting:
Delivery to the following recipient failed permanently:

    [email protected]

Technical details of permanent failure:
PERM_FAILURE: SMTP Error (state 12): 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 for email delivery information and support

You’d have thought at least they’d have the decency to place me in the recipient’s spam folder and let them decide?