On Monday, October 13, 2003, at 02:33 PM, Alan Dayley wrote:

> KMail and many other clients automatically see these tags when you 
> attempt to make a filter for the mail, asking if you want to filter as 
> a mailing list.
>
> -All emails from the list are set with the Repy-To appropriate for the 
> list, such as:
> Reply-To: plug-discuss@lists.plug.phoenix.az.us
>
> -All emails from the list are To: the appropriate list, such as:
> To: plug-discuss@lists.plug.phoenix.az.us
>
> Any of these mail fields should be filter-able to make a filter and 
> put the mail in whatever box you want.  Maybe standard Windows clients 
> or free web based email can only filter on the Subject line, which is 
> what you are asking.  Pesonally, I like it the way it is since the 
> Subject line is kept shorter and the other fields work fine for 
> filtering.

I was on a mailing list where the subject line was modified along ec's 
suggestion.  Almost everyone hated it because it made the mail hard to 
thread. We took a  vote and to sentiment to get rid of the 
[LIST-IDENTIFIER] add on was 80%.