Glossary
List-Unsubscribe header
A message header that lets mail apps show an unsubscribe button next to your message.
ValidReach Team · Updated 2026-10-26
In practice
One-click unsubscribe, defined in RFC 8058, lets the app send the request without opening a page. Large mailbox providers ask bulk senders to support it, so check their current requirements.
Verification and sending
Honouring unsubscribes promptly protects your complaint rate. Verification does not replace it.