On 20 Jun 01, at 17:55, Mike Hicks wrote:

> Actually, the list also contains unsubscribe information in the headers,
> though most mail readers don't notice them (only Pine, AFAIK..)

The Won32 version of Pegasus Mail shows a line reading: 
"[ Double-click this line for list subscription options ] ".

Double clicking gives a pop-up with 3 options buttons: 
    o help/info on list
    o unsubscribe
    o subscribe

Clicking on a button causes P-Mail to show what message it will send 
to what address and asks for conformation.  Pretty slick.

Jay