Error Codes:
# 550 SC-001 Mail rejected by Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help.
# 550 SC-002 Mail rejected by Hotmail for policy reasons. The mail server IP connecting to Hotmail has exhibited namespace mining behavior. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help.
# 550 SC-003 Mail rejected by Hotmail for policy reasons. Your IP address appears to be an open proxy/relay. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help.
# 550 SC-004 Mail rejected by Hotmail for policy reasons. A block has been placed against your IP address because we have received complaints concerning mail coming from that IP address. We recommend enrolling in our Junk E-Mail Reporting Program (JMRP), a free program intended to help senders remove unwanted recipients from their e-mail list. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help.
# 550 DY-001 Mail rejected by 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. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help. http://www.spamhaus.org maintains lists of dynamic and residential IP addresses.
# 550 DY-002 Mail rejected by Hotmail for policy reasons. The likely cause is a compromised or virus infected server/personal computer. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help.
# 550 OU-001 Mail rejected by Hotmail for policy reasons. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help. For more information about this block and to request removal please go to: http://www.spamhaus.org.
# 550 OU-002 Mail rejected by Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation. If you are not an e-mail/network admin please contact your E-mail/Internet Service Provider for help.
# 421 RP-001 The mail server IP connecting to Hotmail server has exceeded the rate limit allowed.
Reason for rate limitation is related to 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 (state 13).
# 220 SNT0-MC3-F28.Snt0.hotmail.com Sending unsolicited commercial or bulk e-mail to Microsoft's computer network is prohibited.
Other restrictions are found at http://privacy.msn.com/Anti-spam/.
Violations will result in use of equipment located in California and other states.