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Glossary

One-click unsubscribe

The List-Unsubscribe and List-Unsubscribe-Post headers, which let people unsubscribe from the inbox without opening a page.

One-click unsubscribe relies on two email headers: List-Unsubscribe, which gives the unsubscribe address, and List-Unsubscribe-Post: List-Unsubscribe=One-Click, defined by RFC 8058. Gmail and Yahoo display them as a button next to the sender. Since 2024, they have required them from regular senders, with unsubscribes processed within two days. Coldlyne adds it to every email and honors it immediately.