I wonder if ESMTPA, ESMTPS, and ESMTPSA (and the same for LMTP) is
the best way to go; I know we're restricted to an ATOM in 2821, but
perhaps this could be relaxed either by allowing additional ATOMs for
WITH or by adding a new OPT-INFO clause such as USING; either way we
could indicate SMTPAUTH and STARTTLS using separate flags to make
combining them easier (especially if something new comes along).
Opinions are personal; facts are suspect; I speak for myself only
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I've been good, and I've been bad, but common sense I never had.
--New Order, "Shellshock"