Hey all, revised my draft based on the feedback I received from this thread.
Changelog: * Added starttls only support. * Provided test cases for IDN names. * Included Jim Fenton's proposal in the related projects section. * No port hardcoding. Removed 26pref and 26only options. Now MX hosts can start with either "smtps-" or "starttls-" prefix * Solution can be used along with STS and DANE https://gist.github.com/mistergiri/a4c9a5f1c26fd7003ebc0652af95d314 Thanks On Mon, Jan 7, 2019 at 1:50 AM Jim Fenton <[email protected]> wrote: > On 1/5/19 7:05 PM, Alice Wonder wrote: > > Well since SMTP is point to point, if you depend upon encryption you > > need S/MIME or PGP and always will. > > Yes, and remember that S/MIME and PGP only encrypt the message body. > There's still quite a bit of information in the message header and SMTP > transaction that aren't covered. > > > > > Also I seem to recall talk of an e-mail header clients can add that > > tell a MTA not to forward it without encryption. > > That's REQUIRETLS, which does this with an SMTP option rather than a > header field (there is also a header field for the opposite request, to > ignore MTA-STS and DANE). > > https://datatracker.ietf.org/doc/draft-ietf-uta-smtp-require-tls/ > > -Jim > > > _______________________________________________ > Uta mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/uta > -- Best Regards, Viruthagiri Thirumavalavan Dombox, Inc.
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