I'm not sure what Hotmail does currently, but it won't matter in the long run 
because the email infrastructure is moving over to Office 365. The DKIM code 
there will interpret a v=2 as an invalid signature.

-- Terry

-----Original Message-----
From: dmarc [mailto:dmarc-boun...@ietf.org] On Behalf Of John R Levine
Sent: Sunday, October 4, 2015 8:35 AM
To: Murray S. Kucherawy
Cc: dmarc@ietf.org
Subject: Re: [dmarc-ietf] draft-levine-dkim-conditional-02

> 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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