List-Unsubscribe-Post (one-click) missing – how to fix
You have List-Unsubscribe but not List-Unsubscribe-Post. One-click unsubscribe is required for best treatment from Gmail and Yahoo.
Why it matters
List-Unsubscribe-Post: List-Unsubscribe=One-Click tells receivers that your unsubscribe endpoint supports a single POST request to opt out. Gmail and Yahoo use this for their one-click button.
How to fix it
Add List-Unsubscribe-Post: List-Unsubscribe=One-Click to the same emails that have List-Unsubscribe.
Ensure the HTTPS URL in List-Unsubscribe accepts a POST request and performs an immediate unsubscribe (no extra click or login required).
Test by sending yourself a message and using the provider's one-click unsubscribe; confirm the address is removed.
Run a free scan
See your domain's current status for SPF, DMARC, and more. No signup required.
Run a free scanRead-only checks. We don't send email or modify DNS.