[Exim] Checking for a header in a system filter.

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Autor: J-P Human
Data:  
A: exim-users
Assumpte: [Exim] Checking for a header in a system filter.
Hi

Using Exim3,
In a sytem filter I use "headers add X-whatever" to add a header.
How do I then check for the existence of that specific header the next
time that email is processed?
Is their a variable or something it will be in?

Thanks and Regards
J-P Human