Re: [Tls-reg-review] TLS ALPN registry: request to add SMTP

["Salz, Rich" <[e-mail]>]

> The SMTP protocol is defined in RFC 2821. I'd like to request
registration for an SMTP TLS ALPN ID. I would suggest the value "smtp".

There's a. couple of things here:
1. That RFC does not mention TLS. 

2. A requirement for being in the registry is that SOME kind of documentation exists, even if it's an individual internet-draft that never does anything else.

3. SMTP and TLS have a complicated relationship. For example there is already port 587 assigned to SMTPS, which is SMTP over TLS. There's the STARTTLS SMTP command in RFC 3207. There's the whole "opportunistic" discussion.

4. So are you proposing port 443 for SMTP/TLS? Do POP and IMAP get involved?

5. Have you had dicussions with other people in the email community about this?  Perhaps the IETF mail extensions working group is a good place to start, https://datatracker.ietf.org/wg/mailext/about/

I think, for now, we have to reject this request, even if only8 for 1 and 2 above.

Thanks for trying to make things more secure.