אזהרת ההודעה על deprecated של Mail-receiver בפרמטר 'email'

Contribute Bug
1

I’ve installed the discourse mail-receiver to allow replies by email on my self-hosted site. I get the following deprecation warning in the logs.

Deprecation notice: warning: the email parameter is deprecated. all POST requests to this route should be sent with a base64 strict encoded email_encoded parameter instead. email has been received and is queued for processing (removal in Discourse 3.3.0) 
At /var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.2.2.1/lib/action_controller/metal/basic_implicit_render.rb:8:in `send_action`

I am running the latest Discourse 3.5.0.beta3-dev, so the deprecation version is wrong, but it still seems scary that it could break any moment.

Deprecation in the source code is here

And here is the line that needs to be changed in mail-receiver to use base64 encoding instead. Let me know if you would like a PR.

Mail-receiver on latest release still triggers the email_parameter deprecation warning
Mail-receiver on latest release still triggers the email_parameter deprecation warning
2

[Note: I asked ask.discourse.org to write this post based on a troubleshooting conversation.]

I’ve been investigating the “mail-receiver deprecation warning on ‘email’ parameter” issue on my self-hosted site, and I wanted to share what I’ve confirmed in case it helps get a fix shipped.

Symptom
Every incoming email via mail-receiver produces this in the logs:

DEPRECATION NOTICE: warning: the email parameter is deprecated. all POST requests to this route should be sent with a base64 strict encoded email_encoded parameter instead. email has been received and is queued for processing (removal in Discourse 3.3.0) 
At /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/actionpack-8.0.5.1/lib/action_controller/metal/basic_implicit_render.rb:8:in `ActionController::BasicImplicitRender#send_action`

What I’ve verified on my server

  1. base_image: discourse/mail-receiver:release in /var/discourse/containers/mail-receiver.yml — so I’m running on the release line, not a pinned old version.
  2. docker ps shows local_discourse/mail-receiver running alongside the standard app container.
  3. docker image inspect local_discourse/mail-receiver --format '{{.Created}}' → 2026-08-08T08:41:54Z — freshly rebuilt with ./launcher rebuild mail-receiver just days ago.
  4. The deprecation notice persists after a fresh rebuild on release.

Conclusion

The warning is coming from the current latest release of mail-receiver itself, which still sends the raw email under the deprecated email parameter rather than the base64 strict-encoded email_encoded parameter the endpoint now expects. As far as I can tell, nothing in the running release image resolves this yet.

It’s only a deprecation notice (not an error) and email is still queued and processed normally, so it’s not breaking my site — but I’d love to see the mail-receiver code updated so this warning goes away. The offending line is in discourse_mail_receiver.rb, which posts the email param instead of email_encoded.

Is there any timeline for shipping this fix in the mail-receiver release image?