Outlook.com

What they published

In their own words.

• Consumer delisting runs through its own support request form, not the delist portal.

  Microsoft Learn, Remove yourself from the blocked senders list and address 5.7.511 Access denied errors · 10 Jun 2024

• Non-compliant bulk mail is junked first and rejected later, rather than rejected immediately.

  “Non-compliant messages will be sent to the junk folder. Shortly we will reject the messages until the DNS records are corrected.”

  Microsoft, Outlook.com postmaster — sender requirements · publisher states no date

The numbers

Only the ones they printed themselves.

• 5,000 emails per day

  Bulk sender threshold

  Domains sending to Outlook.com, enforced from 5 May 2025

  Microsoft, Outlook.com postmaster — sender requirements · publisher states no date

The negative space

One thing everybody repeats that Outlook.com has never said.

An absence is harder to check than a claim, so each one links the page where you can confirm the words are not there — and where Outlook.com states outright that it will not publish something, that refusal is quoted.

• SNDS shows you your Outlook.com reputation.

  SNDS reports on IP addresses you have proved you control — complaint rates, trap hits, filter result. It is data about your addresses, not a reputation score, and it says nothing about a shared pool you do not own.

  Microsoft Learn, Remove yourself from the blocked senders list and address 5.7.511 Access denied errors · 10 Jun 2024

Getting unblocked

The removal path, and whose job it is to file it.

Every delisting guide tells you where the form is. The half nobody prints is whether you can complete it: on a shared sending pool the listed address is your platform’s and the submission is theirs to make, so a marketer sent to the form arrives without the one thing it asks for.

• Outlook.com support request form. A different form from the Microsoft 365 delist portal, with a different queue behind it.

  support.microsoft.com/supportrequestform/8ad563e3-288e-2a61-8122-3ba03d6b8d75

  Part platform, part you

  Whoever owns the listed IP files it. On any mainstream ESP's shared pool that is the platform, and a marketer filing it themselves cannot supply what the form asks for.

  The trap: Microsoft points senders at the troubleshooting FAQ before submitting; submissions that skip it are the ones that go nowhere.

  Microsoft Learn, Remove yourself from the blocked senders list and address 5.7.511 Access denied errors · 10 Jun 2024