It appears that Faisal Misle via mailop <fai...@emailgeek.eu> said:
>While almost nobody reads message headers to see the signature, I can see how 
>it can be useful to see if a
>header was modified in transit. However, how practical/useful/needed is it in 
>real life, and more importantly,
>is there any harm in testing its use?
My dim recollection is that it was intended to help deal with mail that went 
through mailing
lists that add subject tags and the like.  Needless to say, it didn't work.

I don't see any harm in adding z= tags but I would be surprised if anyone 
looked at them.

R's,
John
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