Glossary
What is one-click unsubscribe?
One-click unsubscribe lets someone stop your emails with a single click in their mail app, without visiting a page or typing anything. It works through two email headers defined in RFC 8058, and Gmail and Yahoo now expect it from anyone who sends mail in bulk.
How does it work?
The email carries a List-Unsubscribe header with a web address, and a List-Unsubscribe-Post header that says one click is enough. The mail app shows an "Unsubscribe" button next to the sender's name. One press sends the request; the sender must stop. The standard is RFC 8058.
Who has to support it?
Since 2024, Gmail and Yahoo require one-click unsubscribe from senders who send large volumes of marketing mail. Even below that line, an easy way out means fewer people press "Report spam", which protects every other email you send.
What does Propel do?
The emails Propel sends you, such as notices and the daily summary, carry one-click unsubscribe. In cold email, a reply asking to stop marks that person do-not-contact and ends their sequence. See Connect a mailbox and send safely.