[Users] [feature suggestion] use a more specific subject tag

[Ralf Mardorf]

On Wed, 2 Feb 2022 19:53:19 +1100, Liz wrote:
>One thing that was important was not making it too long

[Users]
[Claws]
[Claws-users]

IMO [Claws] or [Claws-users] makes way more sense. And yes, I filter by
mailing list headers and I'm using an individual folders for mailing
lists already, but a tag in the subject line is still very useful.