Who this applies to#
- List-Unsubscribe applies to mailing-list messages and their removal instructions
What List-Unsubscribe header requires#
- Use RFC 8058 evidence when claiming modern one-click behavior; an arbitrary unsubscribe URL alone does not establish RFC 8058 compliance
What this does not require#
- RFC 2369 makes these headers optional at the protocol level, subject to provider requirements
Common mistakes#
- Calling every unsubscribe URL one-click compliant
- Treating protocol optionality as overriding mailbox-provider rules
List-Unsubscribe header checklist#
- Describe the header accurately
- Distinguish mailto and HTTPS flows
- Check recipient-provider requirements
Commonly confused with#
OnVoard's take#
Keep the general list header and RFC 8058 one-click behavior as 2 related but distinct contracts.