I am inclined to agree. However the [] behavior is rather common. So
we probably should consider whether it is reasonable to have DKIM
contain features that are intended to allow a signature survive
mailing list transit, when we know that the final result will usually
fail.
That's why I use the z= option, regardless of what the
overly proscriptive -base spec says. I don't think this should
in any way be part of the spec though as it is clearly a
heuristic and depends greatly upon how much risk a receiver
wants to tolerate.
Use of the option seems like a reasonable idea. However I am not sure how it
gets used at the validating end.
That is, I do not see what the expected scenario is, once the difference between
original Subject and current Subject is detected.
d/
--
Dave Crocker
Brandenburg InternetWorking
<http://bbiw.net>
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