[Rainbow] Outlook.com Block List


We've now resolved the incident. Thanks for your patience.

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Microsoft have finally implemented Mitigation.

"We have implemented mitigation for your IP ( and this process may take 24 - 48 hours to replicate completely throughout our system.

Sincerely, Outlook.com Deliverability Support."

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Despite Microsoft telling us multiple times we are not on any block list we have found Clients unable to send emails to outlook/live Addresses, we have addressed this with Microsoft once more.

Your Clients may recieve this error when sending to these domains -

host outlook-com.olc.protection.outlook.com [] SMTP error from remote mail server after pipelined MAIL FROM:XXXX@XXXX.XXX SIZE=1990: 550 5.7.1 Unfortunately, messages from [] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [DB5EUR01FT053.eop-EUR01.prod.protection.outlook.com]

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Began at:

Affected components
  • Hosting
    • Reseller Hosting