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Author SHA1 Message Date
Patrick Cloke
9400dc0535
Add the List-Unsubscribe header for notification emails. (#16274)
Adds both the List-Unsubscribe (RFC2369) and List-Unsubscribe-Post (RFC8058)
headers to push notification emails, which together should:

* Show an "Unsubscribe" link in the MUA UI when viewing Synapse notification emails.
* Enable "one-click" unsubscribe (the user never leaves their MUA, which automatically
  makes a POST request to the specified endpoint).
2023-09-11 09:49:48 -04:00