Mail Delivery / Sending Issues
Outlook/Hotmail rejecting Yahoo emails – IP 34.2.94.17 blocked (S3150)
Description:
Emails sent from my Yahoo Mail account to Outlook/Hotmail/Outlook.com.au recipients are bouncing with this error:
“550 5.7.1 – Messages from [34.2.94.17] weren’t sent. Part of your network is on Microsoft’s block list (S3150).”
This means Yahoo’s outbound mail server using IP 34.2.94.17 is blocked by Microsoft.
Please escalate to the Yahoo Postmaster team to:
Request delisting for IP 34.2.94.17 from Microsoft SNDS/JMRP, or
Move my account to a clean outbound IP.
This issue is preventing me from emailing Outlook.com.au recipients.
Thank you.
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Himesh Doshi
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