At 06:05 PM 1/27/2006, you wrote:
 >I have a listowner who runs a "membership required" list. Subscriptions
 >requests are set for owner approval. He would like a mechanism that,
 >when the request to subscribe is rejected, the sender receives
 >notification of why and with instructions on how to become a member of
 >the organization.

On one of my lists I have set up what I think you want. You can find 
it described here:

http://www.panix.com/~donwiss/listowner/mailtpl.txt

Though these days it is probably easier to edit the templates on the 
web instead of e-mailing it in.

Don.