Our group at Harvard University is not able send mail to hotmail accounts
(including mine), all our messages are being rejected with the following
message. Our going mail is coming from the harvard.edu domain, perhaps
from ackroyd.harvard.edu. This was working fine until very recently.
Please change things back to allow our domain to send mail to hotmail accounts.
host mx2.hotmail.com[65.55.37.104] 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)