Allow me to bump this thread. I believe there is a bug somewhere. Either in the 
code, or in the documentation.

On 18 May 2023 21:13:50 CEST, "Léo El Amri via dovecot" <dovecot@dovecot.org> 
wrote:
>Hello there,
>
>When using the doveadm command (search HEADER "X-Discourse-Post-Id" "") or the 
>IMAP command (SEARCH HEADER X-Discourse-Post-Id ""), emails containing a 
>X-Discourse-Post-Id header are not listed.
>
>I've also tried with non X- headers, such as List-Unsubscribe and 
>Auto-Submitted.
>
>RFC 3501 [1] and Dovecot's documentation [2] both says that this command 
>should return emails containing the header searched.
>
>I couldn't find a mention of this bug in the git history, hence why I'm 
>posting here, maybe there is something wrong with my installation ?
>
>I'm running Dovecot 2.3.20 on Debian on amd64 with an ext4 filesystem. I 
>attached the output of dovecot -n.
>
>[1]: https://www.rfc-editor.org/rfc/rfc3501.html#section-6.4.4
>[2]: https://wiki.dovecot.org/Tools/Doveadm/SearchQuery
>
>-- 
>Cordially,
>Léo
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