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I have exim4 installed on a debian wheezy box and configuring it seems difficult.

I have a dynamic list of usernames (A user named $USER exists iff the directory /.../us/$USER exists).

When exim receives an email for, I want it to

  • Fail if user is not in that list
  • Pipe the email to a script otherwise

How can I configure exim4 to do this?

Note: The format of the username list is not that important since I control the user-adding code and therefore I can change it to something more exim-friendly

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