>Specifically, is there a way a current subscriber can change the address at
>which they receive mail in a way such that the same command confirms that the
>subscriber is currently on the roster, deletes the original address, adds the
>new address, and, most importantly, preserves the subscriber's current mail
>receipt options?
 
No.
 
(Now if the user him/herself had a generic address e.g.,
[log in to unmask] which re-directed mail to the preferred e-mail
system ([log in to unmask]) which was able to generate
e-mail FROM: that generic address, then you would not need
to do anything.)
 
/Pete Weiss at Penn State