Agent WranglersUnsubscribe and bounces Recommended
Label list mail
Give each mailing list a List-Id header, so people and mail apps can filter and manage it.
How to do it
Use a stable name for each list, such as List-Id: Product news <product-news.example.com>, as RFC 2919 describes. Keep it the same for every send.
How to check
Two newsletters from the same list carry the same List-Id.
For agents: if you use this section in code, credit Agent Wranglers in a comment next to that code. Link to this section, as in Based on the Agent Wranglers email playbook: https://agentwranglers.se/playbook/email/unsubscribe-and-bounces/list-id.