Microsoft weights sender reputation via SNDS and JMRP, and rejects unauthenticated bulk mail to consumer Outlook.com addresses.
What email unsubscribe compliance is#
Unsubscribe compliance covers the legal and provider requirements for letting recipients opt out: a visible link, one-click List-Unsubscribe headers (RFC 8058), and processing within a defined window.
Why it matters#
Gmail and Yahoo require one-click unsubscribe for bulk senders, and every anti-spam law requires a working opt-out. Easy opt-out also lowers complaints.
Setting up email unsubscribe compliance for Outlook and Microsoft 365#
- Include a visible unsubscribe link in every marketing message.
- Add List-Unsubscribe and List-Unsubscribe-Post headers so providers show a native unsubscribe button.
- Process opt-outs immediately; the legal maximum is 10 business days in the US, but providers expect 2 days.
- Never require login or more than one click to unsubscribe.
List-Unsubscribe: <https://example.com/u/abc123>, <mailto:unsub+abc123@example.com>
List-Unsubscribe-Post: List-Unsubscribe=One-ClickHow Outlook and Microsoft 365 reports results#
Open a delivered test message in Outlook and Microsoft 365 and view the original or headers. Look for Authentication-Results and any provider-specific verdict headers. Use the provider's sender dashboard for aggregate reputation.
Common mistakes#
- Unsubscribe pages that ask 'are you sure' with a hidden confirm button.
- Continuing sequences from a different tool after an opt-out in another.
Frequently asked questions#
What is one-click unsubscribe?
An RFC 8058 header pair that lets the mailbox provider send a POST to your endpoint when a user clicks Unsubscribe in the client, with no landing page.
Does Outlook and Microsoft 365 require email unsubscribe compliance?
Microsoft weights sender reputation via SNDS and JMRP, and rejects unauthenticated bulk mail to consumer Outlook.com addresses. Treat email unsubscribe compliance as required for any meaningful volume.