Outlook.com S3150 block: olcsupport form returns "Error submitting case" - is there another way to contact the deliverability team?

Question

Outlook.com S3150 block: olcsupport form returns "Error submitting case" - is there another way to contact the deliverability team?

Wajid 0

Hello,

Our mail server's IP is being rejected by Outlook.com / Hotmail / Live with:

550 5.7.1 Unfortunately, messages from [x.x.x.x] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150).

We have fixed the likely cause on our side and want to request mitigation, but the Sender Support form at olcsupport.office.com fails every time. After pressing Submit it shows "Thank you - your request was submitted. Error submitting case", and no case number or confirmation email ever arrives. We have tried several times, from different networks and with both a work and a personal Microsoft account, with the same result.

Questions

Is the olcsupport form currently having problems, and is there a known fix?
Is there another way to reach the Outlook.com deliverability team to request mitigation for an S3150 block (for example an email address or alternative form)?
Is [email protected] the right contact for S3150 consumer blocks, or is it only for Microsoft 365 (5.7.511) blocks?

We'd prefer not to post our IP publicly, so a private route would be ideal.

Thank you.

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1 answer

Your answer

Answer 1

EmilyS726 280.2K Independent Advisor

Hello

There's currently a global outage affecting some Microsoft services, including Outlook, OneDrive, Copilot and others. It is an issue on Microsoft's end. Service status can be monitored here https://status.cloud.microsoft/

Or via Msft's X/Twitter page: https://x.com/MSFT365Status/status/2120938282204688468

Wajid 0 Reputation points

2026-11-13T02:41:12.79+00:00
Thanks, I didnt think to check that.

The S3150 block itself started over a week before today, so I don’t think the outage caused it. But the outage could explain why the delisting form keeps failing.

Two quick questions:

Does the current incident also affect the Outlook.com sender support form (olcsupport.office.com)? Every submission ends with “Error submitting case”.

Is there another way to send a delisting request to the Outlook.com deliverability team? For example, could a moderator escalate it, or is there a support email for consumer (S3150) blocks? As I understand [email protected] is only for Microsoft 365 (5.7.511) blocks.

Thanks again.
Wajid 0 Reputation points

2026-11-13T02:41:59.78+00:00

Duplicate comment
EmilyS726 280.2K Reputation points Independent Advisor

2026-11-13T02:46:10.1766667+00:00

Microsoft's outage noticed doesn't cover every single service affected, but behind the scene, services that rely on some of the same Microsoft cloud infrastructure are all affected. So yes, the delist request form can be also affected.

Unfortunately there's no way for forum advisor or moderator to escalate this. I am afraid you would have to wait til service is restored to try again, because even if you manage to submit it, they need to be able to email you back, but not when email service is down. I am sorry.