URL for unsubscribing here

Sean Straw wrote,

| background for the test message: I'm considering making a simple web-based
| unsub interface for the procmail list -- a place to direct people to go
| when they want to unsub and can't cope with email properly.

Won't 
<mailto:procmail-request(_at_)informatik(_dot_)rwth-aachen(_dot_)de?Subject=quit>
 do
the job?