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send_email: Remove List-Unsubscribe-Post from remote-server emails.

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For remote servers, we cannot advertise `List-Unsubscribe=One-Click`,
which is specified in RFC 8058[^1] to mean that the `List-Unsubscribe`
URL supports a POST request with no arguments to unsubscribe.  Because
we show an interstitial and confirmation page, as this is not just a
mailing list which is disabled if you click the link, it does not
support the mail system performing the unsubscribe for the user.

Remove the inaccurate header for remote servers.

[^1]: https://datatracker.ietf.org/doc/html/rfc8058
This commit is contained in:
Alex Vandiver
2023-12-15 16:42:32 +00:00
committed by Tim Abbott
parent 0fe725fdbd
commit 8102519242
1 changed files with 2 additions and 1 deletions
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3
zerver/lib/send_email.py
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@@ -198,7 +198,8 @@ def build_email(
# have not implemented.
if "unsubscribe_link" in context:
extra_headers["List-Unsubscribe"] = f"<{context['unsubscribe_link']}>"
extra_headers["List-Unsubscribe-Post"] = "List-Unsubscribe=One-Click"
if not context.get("remote_server_email", False):
extra_headers["List-Unsubscribe-Post"] = "List-Unsubscribe=One-Click"
reply_to = None
if reply_to_email is not None: