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Re: [ietf-smtp] Fwd: New Version Notification for draft-fenton-smtp-require-tls-01.txt

2016-02-13 19:54:39
Further comments are of course appreciated.

I still don't get it.  If a sender wants to talk only to MTAs that
support STARTTLS, it can just do so, and on today's Internet that
covers the vast majority of mail.

As soon as you try to get clever, you quickly run into perverse
effects.  Here's an example:

You send a message to a mailing list with the SMTP required flag.
Does that mean that the list should preserve the flag so its outbound
MTA applies the rule to the message when it's sent out the recipients?
If not, seems pretty ineffective.

If so, you're going to have a bunch of bounces from mail to
subscribers whose MTAs don't support TLS, and history suggests that
the list software will do what it does and those subscribers will get
bounced off the list.  (DMARC fans will find this scenario familiar.)
So what's the list supposed to do?


PS: I know what I'd do, but you already knew that.

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