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Date: Thu, 31 Jul 2025 17:12:10 +0100 (BST)
To: Mathieu Rochette <mathieu@rochette.cc>
cc: PHP Systems <systems@php.net>, PHP internals <internals@lists.php.net>
Subject: Re: [PHP-DEV] Headers of the PHP mailing lists
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From: derick@php.net (Derick Rethans)

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Hi Mathieu,

Questions around this, are probably better directed at systems@php.net,=20
but it's here now, so I'll answer.

On Thu, 31 Jul 2025, Mathieu Rochette wrote:

> At work we built a feature in a mail client that deals with=20
> newsletters subscriptions.=C2=A0
>=20
> Subscriptions are identified by messages having a List-ID or=20
> List-Unsubscribe header. Then, to differentiate mails being=20
> newsletters or list discussions, one heuristic is to look at the=20
> `Precedence` header, it can be `bulk` for mass mailing (so=20
> newsletters) or `list` (discussions). And when working on that I=20
> noticed that PHP lists were wrongly sent the mails with `Precedence:=20
> bulk`. Is this something that could be fixed?

I can certainly change the "Precedence: bulk" header to "Precedence:=20
list". I would have to do that for all our 124 lists, but I am=20
moderately reluctant in doing this, as Google is being annoying=20
requiring specific things for email delivery, and I don't want to upset=20
them again.

> It's not a big deal since I've since added another=C2=A0heuristic=C2=A0th=
at=20
> works woth the PHP mailing lists (classify subscription as discussion=20
> is it has a `List-Post` header) but wanted to let you know, it may be=20
> useful for other clients if / when they implement features using those=20
> headers.
>=20
> Also, the List-ID is not properly formatted, it's supposed to be=20
> wrapped in angle brackets but it's not, so instead of `List-Id:=20
> internals.lists.php.net`=C2=A0it should be=C2=A0`List-Id:=20
> <internals.lists.php.net`> or even=C2=A0``List-Id: PHP=C2=A0Internals=20
> list=C2=A0<internals.lists.php.net> to give it a human friendly name. One=
=20
> downside of fixing it though is that it may break automatic filtering=20
> rules of people matching exactly=C2=A0`List-Id: internals.lists.php.net`.=
``

We can easily change the List-Id header too, as long as I don't need to=20
add a manual description to all 124 of them. So for now, I would suggest=20
to change them to "List-Id: <internals.lists.php.net>". Would that work?

cheers,
Derick

--=20
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