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

[Viruthagiri Thirumavalavan <[e-mail]>]

Hello UTA WG,

I have a proposal for SMTPS (Implicit TLS), port 25 secure alternative on a
new dedicated port 26.

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.

I'm proposing a very simple solution. It's actually dead simple. So i'm not
really sure whether it was proposed before and got rejected for some
reasons or you guys really missed that one.

I'm hoping it was the latter. But If it was already proposed and rejected,
then forgive my ignorance.

The content is prepared for a blog post. You guys don't have to go through
everything. Read abstract and then skip to the proposal section.

https://gist.github.com/mistergiri/a4c9a5f1c26fd7003ebc0652af95d314

Let me know if it is worth the effort. If it is, then I'm happy to create a
draft for IETF proposal.

Thanks
-- 
Best Regards,

Viruthagiri Thirumavalavan
Dombox, Inc.