Wanted: Mailing List Request Program

[Craig Daily]

I'm looking for a program or script that processes incoming mailing list 
requests such as, "group-request at pge.com", and automatically adds the user to
an alias list for future mailings.

I understand how to set up an alias for "group-request" and how to pipe the
incoming mail through a program.  However, I'm betting that someone has
already put together a program that handles this type of request elegantly
and would be willing to share.  If you know of such a program, please send
e-mail directly to me.  Thanks in advance.  :-)

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Craig S. Daily          |    <csd1 at cs.pge.com>    |   {uunet}!pge!amigo!csd1
** All opinions expressed are my own and are not an official PG&E statement. **