Re: [Uta] SMTP Over TLS on Port 26 - Implicit TLS Proposal

[Viruthagiri Thirumavalavan <[e-mail]>]

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 <[e-mail]> 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
>
>
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-- 
Best Regards,

Viruthagiri Thirumavalavan
Dombox, Inc.