[Users] See the 'FILES' section of `man claws-mail` for brief descriptions of the files.

[Removed GDPR]

> The Subject: should be a short descriptive statement about the
> message. The body should be able to stand on its own. In this way
> there is nothing lost if or when the subject is changed or the thread
> drifts.

Is that not the case? Or is there anything unclear in the question that
I have to ask in a different way? Or are you explaining in general?

> This is an simple basic rule of email, mailing lists, and Usenet. The
> discusion belongs completely in the body.

I am sure Paul knows much better than me how these things work.
FWIW: This is the first time I am using a mailing list. Never touched
Usenet.