Tony Hansen wrote on <ietf-822.imc.org>
fyi, this seems relevant to these two lists.
Thanks, answered on the general list, forwarding your pointer
to the ASRG list. Maybe I simply don't get it, or the I-D
proposes to send special NDRs for mails considered as dubious
by OPES, and the "special" feature is a way to bypass OPES on
behalf of the (alleged) sender in another mail.
That would be a convoluted kind of challenge response system,
and the discussion of this known 2821 issue in the draft does
not justify this net abuse.
http://www.ietf.org/internet-drafts/draft-ietf-opes-smtp-security-02.txt
Frank
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