As John pointed out, RFC6376 requires that the signature not pass for any
"v=" value other than 1. It won't even get as far as considering the "!"
tags.
He said "most" implementations he checked will conform to that. I thought
it was "all"; perhaps he'd care to elaborate.
All the ones that anyone has checked. Since the code for places like
Hotmail isn't available, you'd have to send them some v=2 signatures and
see what happens. I haven't done that, although I'd be pretty surprised
if they interpreted the spec differently from everyone else.
R's,
John
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