> 
> Hmm....  I would do something like this (untested):
> 
> header RELAY_NOT_US X-Relay-Countries =~ /\b(?!US)[A-Z]{2}\b/
> 

I've had to use, IIRC.
X-Relay-Countries =~ /\b(?!US|XX)([A-Z]{2})\b/

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