list-unsubscribe
also: List-Unsubscribe header, RFC 2369
An email header that provides a standardized way for recipients to unsubscribe from mailing lists, typically containing a URL or mailto address.
The List-Unsubscribe header is an optional email header defined in RFC 2369 that allows mailing list administrators to provide recipients with an easy, standardized method to opt out of future messages. It contains either an HTTP URL, a mailto address, or both, enabling one-click unsubscribe functionality in email clients that support it.
For example, a mailing list might include: List-Unsubscribe: <https://example.com/unsubscribe?token=abc123>, <mailto:[email protected]>
Email clients like Gmail and Thunderbird recognize this header and display an unsubscribe button in the message interface. This improves user experience and helps maintainers comply with email regulations like CAN-SPAM and GDPR that require straightforward unsubscribe mechanisms.