>I had not noticed -- and still don't quite understand -- what it is
>about the new stuff that will cause a legacy engine to fail the
>signature validation.
It's in section 3.5 of RFC 6376, the part about the DKIM-Signature
header, where it says:
v= Version (plain-text; REQUIRED). This tag defines the version of
this specification that applies to the signature record. It MUST
have the value "1" for implementations compliant with this version
of DKIM.
ABNF:
sig-v-tag = %x76 [FWS] "=" [FWS] 1*DIGIT
INFORMATIVE NOTE: DKIM-Signature version numbers may increase
arithmetically as new versions of this specification are
released.
People have looked at the code in most existing DKIM verifiers to see
whether the code matches the spec, and the current code does indeed
reject signatures that don't start with v=1.
R's,
John
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