One-click unsubscribe
Also called: List-Unsubscribe, List-Unsubscribe-Post, RFC 8058
One-click unsubscribe is a pair of email headers that let the mail app show its own Unsubscribe button, which unsubscribes the person with a single click and no web page.
RFC 8058 defines it: a List-Unsubscribe header with an HTTPS address, plus List-Unsubscribe-Post: List-Unsubscribe=One-Click. The mail app sends an HTTPS POST to the address; the sender must not redirect it, and both headers must be covered by a valid DKIM signature (RFC 8058).
How it affects cold email
Gmail requires one-click unsubscribe for marketing and subscribed messages from bulk senders, along with a visible link in the body, and recommends honouring requests within 48 hours (Google FAQ). Yahoo requires it for bulk senders and asks for unsubscribes to be honoured within 2 days (Yahoo).
For cold email it is simply good sense: a person who can leave in one click has less reason to press “Report spam”.
How Inboxed handles it
- Every campaign email carries both headers and a visible unsubscribe line (you can word it yourself, or place the link in the body). A click unsubscribes the person from everything your workspace sends straight away, and they can undo it themselves within 24 hours. Unsubscribes go on the suppression list and can’t be removed by your team.
Related terms
Sources
Sources checked on 8 November 2026. Rules change, so check the source before you rely on a detail.
- RFC 8058: Signaling One-Click Functionality for List Email Headers · IETF / RFC Editor
- Email sender guidelines · Google, Gmail Help
- Email sender guidelines FAQ · Google, Gmail Help
- Sender Best Practices · Yahoo Sender Hub
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