Hello,
just as there is HTTP Strict Transport Security (HSTS) preload list — a text
file full with hosts that are dedicated to
deliver all content over HTTPS, there is also “MTA Strict Transport Security
(MTA-STS) preload list” — a text file
containg domains and subdomains, that are committed to offer STARTTLS.
https://starttls-everywhere.org/
Providing that the implementation of MTA-STS and MTA-DANE is not simple,
integrating the STARTTLS everywhere list is
simpler.
Regards
Дилян
On Mon, 2019-01-07 at 13:55 +0530, Viruthagiri Thirumavalavan wrote:
Hello Everyone,
I have proposal for SMTPS. Already gathered some feedback from UTA working
group and improved my draft.
My proposal is a very simple document. So, please go though it and give me
feedback if you can.
Here is my abstract.
---------
SMTP is still suffering from downgrade attacks like STRIPTLS. While we have
"Opportunistic TLS", we still don't have "Implicit TLS" in the SMTP. Don't
get me wrong.. We do have "Implicit TLS" for "SMTP Submission" on port 465.
But we don't have a secure port 25 alternative. i.e. The real SMTPS
Both MTA-STS and MTA-DANE tries to fix the STARTTLS downgrade issue. However
the implementation is not simple. The former requires a HTTPS server and the
latter requires DNSSEC.
This document propose a new port 26, an "Implicit TLS" alternative for port
25 and recommends the MX server to signal the port via a prefix.
e.g. mx1.example.com should be prefixed like smtps-mx1.example.com.
Where "smtps-" says "We prefer if you connect to our SMTPS in port 26. But we
also accept mails in port 25. And our port 25 supports Opportunistic TLS. So
if STARTTLS command not found in the EHLO response or certificate is invalid,
then drop the connection".
--------
Thanks
--
Best Regards,
Viruthagiri Thirumavalavan
Dombox, Inc.
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