I think the difficulty may depending on the TLS library to use.
When I looked at years ago wrt openssl, it appeared to me that the
work require rewriting I/O stuff in nmh. Of course, I was not an
expert at the time, but I did not see a quick fix to the problem.
Recently (post-1.3) I made a bunch of changes to the SMTP network
code; part of that was running the I/O though the SASL
encryption/decryption routines. Shouldn't be too bad to call
openssl_whatever() instead of sasl_encode(). Obviously there will
have to be some initial negotiation as well), but anyway, my point
is some of that work should already be done.
--Ken
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