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matrix-org / synapse

Synapse: Matrix homeserver written in Python/Twisted.
https://matrix-org.github.io/synapse
Apache License 2.0
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Add the List-Unsubscribe header for notification emails. #16274

Closed clokep closed 1 year ago

clokep commented 1 year ago

This adds two headers List-Unsubscribe (RFC2369) and List-Unsubscribe-Post (RFC8058) to push notification emails, which together should:

  1. Show an "Unsubscribe" link in the MUA UI for our notification emails.
  2. Enable "one-click" unsubscribe (the user never leaves their MUA).

AFAIK The major players (Google, Yahoo, Microsoft, etc.) all support List-Unsubscribe, while List-Unsubscribe-Post is supported by fewer MUAs.

Fixes #16217

clokep commented 1 year ago

Note that I haven't really been able to test this since headers most be covered by a valid DKIM signature.