Hi,

> So, how would I do this with only sending a single "bounce" to any
> email address?

Pipe to vacation(1), e.g. the user's ~/.forward:

    \foo, "|/usr/bin/vacation foo"

The first keeps a copy of the email.  vacation can be told to only send
the reply once per N days for each recipient, default seven IIRC.

-- 
Cheers, Ralph.
https://plus.google.com/+RalphCorderoy

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