While I might have overlooked an option which actually allows the
sending of a full chain, do you think it would be reasonable, and
in the scope and the spirit of the S/MIME Working Group, to mandate
that client MUST(?)/SHOULD(?) have an option that sends all information
available to validate the sender cert (cert chain + possibly crl and/or OCSP).
This behaviour came out as a Best Practice recommendation from the
analysis of the results for the recent EEMA PKI Challenge project.
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