As I said it was not necessarily to do mail filtering on the mail clients, but to separate email (in some even cases visually) that helps out people, a pure cosmetic thing.

I see the reasons on the w3.org website and they make complete sense, but in the other hand I don't see either that causing much issue. Is more as they say: "because we would rather see effort invested in getting mail software fixed to do the right thing than provide workarounds that provide no incentive to do so, at the expense of users whose mail clients already do the right thing."
I think is over concerning with something that doesn't cause that much issue other than what is stated on the w3 website, maybe.
In any way, thanks for replying and for providing the URLs as base.
No worries as this will not change the propose of the list.

Best regards all,
Fernando

On 17/10/2014 18:17, Florian Lohoff wrote:

On Fri, Oct 17, 2014 at 04:00:19PM +0100, Fernando Frediani wrote:

Guys,

I don't see much a problem. It's not about filtering (this can be
done in many ways), just about having the miallist title on the
email Subject in order to be better identify the email.

Most of the maillists I'm in have the name on the Subject of all
emails in the format [XXXX] and this does not cause any issues for
anyone as far as I know.

http://www.w3.org/Mail/subject-tagging

and one of the most traffic intensive lists like Linux Kernel:

http://www.tux.org/lkml/#s3-19

Flo