In article
<dfa17007-a637-88d8-339c-a6225b1648c5(_at_)network-heretics(_dot_)com> you
write:
(I do also wonder how many existing SMTP servers can handle TLS with
client certificates, because that seems like that would also be a
recommendation worth considering.)
Several, as noted, and there are some old patches for qmail to do it, too.
But once again, this is submission, not SMTP. A client certificate is
a plausible way for a submission client to authenticate itself to the
submission server.
R's,
John
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