Change priority in mail headers?

Hi everyone,
My host runs Exim for it's mail server. I unfortunately
know nothing about mail servers but would like to know how to change the
Priority of an incoming email to X-Priority: 1 (Highest) before it is
forwarded to another email address.

This has to be for only one email address and no others on the server.
If someone could post details on how to do this and I can pass it on to
my host to implement.

Thank you.



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73 de Simon, VK3XEM.
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