On Wed, Mar 26, 2025 at 9:31 AM Alessandro Vesely <ves...@tana.it> wrote:
> It's a matter of MTA design. The closer the specification adheres to SMTP, > the > wider the implementation choices. > I think about this differently: Right now, you could implement STD 76 DKIM via a pipeline. The only thing it needs as input is a message. An MTA could pipe a message as it comes over the wire in the DATA block to a signer or verifier and it would work. Requiring any part of the envelope, or knowledge of SMTP routing, is a significant departure and means this simple "pipe the pure message" interface can't work. You need something more complex; significantly, you need the envelope, and you need to clone the routing logic from the MTA to the filter (or build it into the MTA directly). -MSK
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