[Exim] archiving outgoing mail

Archiving incoming mail was easy enough. I added this router:

archival:
driver = redirect
domains = thedomain.com
data = archive@???
unseen

And set up a cron job to tar the contents of the mailbox up and
remove the files.

I'm stuck on how to do the same to outgoing mail. If I can just get it
to send a copy to the archive account (without getting into an
infinite loop, of course!), the problem would be solved.

Rossz