Re: [yam] draft-daboo-srv-email: POP3S/IMAPS?

[Magnus Westerlund <[e-mail]>]

Arnt Gulbrandsen skrev 2010-01-20 10:28:
> Lars Eggert writes:
>> I'm not on the yam list and this is the first message in this thread
>> that I was CC'ed on. It seems like you are suggesting changes to
>> draft-ietf-tsvwg-iana-ports, but due to the lack of context I'm at a
>> loss as to what they are...
> 
> Tthe thead in a nutshell: The iana-ports document says "one port for
> each purpose" etc. IMAP, POP3 and perhaps SMTP, however, exist in two.
> 993 ("imaps") and 143 ("imap") for IMAP. Everyone on the list dislikes
> port 993. The question is whether port 993 should survive in the IANA
> registry.
> 
> My suggestion for the iana-ports document is to permit more than one
> port in those cases where that's currently deployed, and apply the
> one-port-per-purpose rule only to new allocations.
> 
> My rationale for that is that the extra ports/service names aren't
> really free. You can't use port 993 or service name imaps for anything
> else, and IMO that's reason enough to keep it in the registry.
> 
> The same argument applies to pop3s/995, and perhaps to smtps/465 (smtps
> is falling out of use).
> 
> Arnt

Our intention was never to force the already registered entries to
follow the new registration procedures. The document describes the
procedures that will be in place from the moment they are approved by
the IESG. Legacy is legacy, and I do agree that even if port 993 is
returned it will still be reserved for a long time.

Don't use the draft-ietf-tsvwg-iana-ports as an argument either way if
YAM should retire the the "secure" ports and instead focus on using a
START_TLS procedure. That has to be discussed in the context of the
existing protocol and its benefits and disadvantages.

Cheers

Magnus Westerlund

IETF Transport Area Director
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