[exim] Add a header when reverse DNS fails or defers?

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MMarc Sherman
MWalt Reed
M+\Marc Sherman
||MWalt Reed
|MPhilip Hazel
|M\Marc Sherman
||MPhilip Hazel
||MMarc Sherman
M||Marc Sherman
||MPhilip Hazel
M|Philip Hazel
M|Marc Sherman
|MJim Roberts
MPhilip Hazel