Customize Permission Denied email

Hello,

Generally, we restrict access to a request so that only addresses
associated with the request can post to it. From time to time, someone
is listed as a CC with one email address, which forwards mail to a
second one. When they reply, they get a “Permission Denied” response as
their secondary email address isn’t associated with the request.

Is there an easy way to modify the “Permission Denied” response message
to add in a few lines of text? We’re looking to just add a sentence
explaining why the bounce occurred and recommending that they use the
web interface.

Thanks,

Eric Gauthier
Network Engineer
617-353-8218 ~^~ elg@bu.edu
Boston University - Information Technology