Doranna,
In that case, is it possible for rejected responses to
receive an auto-reply?
Not exactly, but...
In the Member Notices tab of your (sub)group's Settings page you may create one or more notices of type "Rejected Message".
When rejecting via the web there is a drop-list to select which of those (if any) you'd like to copy into the rejection you're about to send. You can edit it further before sending (that won't alter the stored version).
When rejecting via email the one "Rejected Message" notice marked "Active" will be sent.
Shal
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