I self-host a number of Discourse instances using mail-receiver. I noticed the conversation below, and am wondering – do I need to Rebuild the mail-receiver.yml files for these sites? [Bild] Remove smtp_should_reject & discourse-smtp-fast-rejection Development Continuing the discussion from Seeing smtp_should_reject "400 bad request" failures on bounce processing: I’m making this topic to summarise some internal discussion we’ve had. We’ve identified that the codepath in smtp_should_reject is not functioning correctly and causing mail to be rejected in situations where it should not be. Specifically: bounce messages (having a null envelope-from) forwarded mail to mismatch (the fast-rejection check used the envelope-to, whereas Discourse uses the…

You can update either mail-receiver or Discourse and it’ll fix the problem.

Self-Hosting – Wann sollte man mail-receiver neu erstellen?

supermathie (Michael Brown) 25. November 2025 um 20:42 2

Sie können entweder den mail-receiver oder Discourse aktualisieren, und das behebt das Problem.

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Remove smtp_should_reject & discourse-smtp-fast-rejection Development	2	218	25. November 2025
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Reducing backscatter in email interface? Feature	22	3606	27. November 2025
Mail-Receiver Configuration: 403 Error on smtp_should_reject Endpoint Product Support mail-receiver	1	169	20. Februar 2025