Hector Santos wrote:
If DKIM h= has from:to:subject:date: and one or more
of these fields are missing - BINGO - instance REJECT
Wait a moment, didn't DKIM support the concept of a
signed *absence* of certain header fields using h= ?
*In theory* it could make sense to add Reply-To and
Sender always to h=, no matter if they are present
or not, because a Reply-To or Sender inserted later
could a bad idea or malicious. A practical case is
Content-Type, present or absent, any modification
would be highly suspicious.
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