[exim] exim outgoing only mail with backscatter protection

I'm desiring to only use exim for outgoing mail.

It appears exim will only run in daemon mode if it's listening
to port 25.

Let me know the best way to:

    1) clear the queue (looks like exim should be run in cron every few minutes)

    2) simple config to route queued mail for local host to port 25 for delivery

    3) simple config to route all other queued mail to it's remote destinations

    4) addition of a header 'token' to be used to guard against backscatter bounces,
       which must be generated randomly and saved in a SQLite database file for periodic
       expiration (deletion)

Since this seems like a fairly common setup, I'll publish the exim.conf
file when all this is working.

Thanks for your assistance.

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