I am using an SMTP relay on my server. The relay provider is Brevo
formally Send In Blue. I am wondering how I can verify weather message id
or in-reply-to headers are being modified.

Thank you,
Paul 'Arte Chambers' Robey
502-408-6922


On Wed, Mar 5, 2025 at 12:00 PM Stephen J. Turnbull <
turnb...@sk.tsukuba.ac.jp> wrote:

> Arte Chambers via Mailman-users writes:
>
>  > Hello, my Hyperkitty is creating a new post for each reply in a
>  > thread. I would expect that new posts to a list would show up in
>  > the archive and once you click on that thread you would see all
>  > replies.
>
> This is the default behavior if I understand what you are saying
> correctly.  Here is a typical thread for this list:
>
> https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/ADWTZKJHXPC6DPD7H2CJBD5EMG6T6ZSR/
> Here is the list of threads:
> https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/
> There's also a recent threads view:
> https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/latest
>
> Are those different from what you expect?
>
>  > However in my Hyperkitty each reply to a thread shows up as its own
>  > post usually with the subject line saying RE: Original Message. How
>  > can I set up Hyperkitty to behave more like the lists.mailman3.org
>  > archives where replies to topics are filed under their respective
>  > threads?
>
> As far as I know, threading is not configurable in HyperKitty; to
> inhibit it you would have to patch the code.
>
> The only thing I can think of that would cause the behavior you
> describe is if the Message=ID or In-Reply-To and References headers
> are corrupt or missing from the replies.  If you use certain services
> to send mail (AWS SES for example), Message-ID corruption may be
> imposed on your subscribers for the convenience of the provider.
>
> The traditional algorithm (as entertainingly described by Jamie
> Zawinski in https://www.jwz.org/doc/threading.html and somewhat less
> entertainingly in https://datatracker.ietf.org/doc/html/rfc5256 by
> Marc Crispin et al) does consider the Subject field and order by date
> within subjects in the absence of reference information as a crude
> approximation to true threading, but I don't know if HyperKitty uses
> Subject information.
>
> Steve
>
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