> | Good point. Using procmail you _could_ insert the heading but then you'd
> | have to take it back out if you composed a reply to someone.
> The irony there is that if you have filtering software such as procmail a-
> vailable to recognize mail from that list in the first place so that you can
> add the tag to pieces that come from the list and not to all of your incoming
> mail, you can use it to file mail from that list into its own folder, and
> then you wouldn't need to have the subject lines tagged, nor to remove the
> tag when you respond.
You missed the whole point here. Many people like to filter things into
folders based on high-level topic. This may mean multiple mailing lists
all getting filtered into the same folder.