On Thursday, July 31st, 2025 at 18:13, Derick Rethans <derick@php.net> wrote:
> Hi Mathieu,
>
> Questions around this, are probably better directed at systems@php.net,
> but it's here now, so I'll answer.
noted.
>
> On Thu, 31 Jul 2025,
>
> Mathieu Rochette
>
> wrote:
>
> > At work we built a feature in a mail client that deals with
> > newsletters subscriptions.
> >
> > Subscriptions are identified by messages having a List-ID or
> > List-Unsubscribe header. Then, to differentiate mails being
> > newsletters or list discussions, one heuristic is to look at the
> > `Precedence` header, it can be `bulk` for mass mailing (so
> > newsletters) or `list` (discussions). And when working on that I
> > noticed that PHP lists were wrongly sent the mails with `Precedence: bulk`. Is this something that could be fixed?
>
>
> I can certainly change the "Precedence: bulk" header to "Precedence:
> list". I would have to do that for all our 124 lists, but I am
> moderately reluctant in doing this, as Google is being annoying
> requiring specific things for email delivery, and I don't want to upset
> them again.
I would be surprised if they penalized you for this since you'll more accurately describe the messages. I don't know how their delivery systems works though, so I understand if you don't want to gamle on it 👌
>
> > It's not a big deal since I've since added another heuristic that
> > works woth the PHP mailing lists (classify subscription as discussion
> > is it has a `List-Post` header) but wanted to let you know, it may be
> > useful for other clients if / when they implement features using those
> > headers.
> >
> > Also, the List-ID is not properly formatted, it's supposed to be
> > wrapped in angle brackets but it's not, so instead of `List-Id: internals.lists.php.net` it should be `List-Id: <internals.lists.php.net`> or even ``List-Id: PHP Internals list <internals.lists.php.net> to give it a human friendly name. One downside of fixing it though is that it may break automatic filtering rules of people matching exactly `List-Id: internals.lists.php.net`.``
>
>
> We can easily change the List-Id header too, as long as I don't need to
> add a manual description to all 124 of them. So for now, I would suggest
> to change them to "List-Id: <internals.lists.php.net>". Would that work?
Yes that would be great, adding a description is optional and can be done later too. if you feel like it you could do it only for the most used lists too for example.
thank you,
Mathieu
