Re: [Ieprep] Discussion of Internet-Draft for SMTP priorities

[Rex Buddenberg <[e-mail]>]

coupling of possibly disparate efforts.

Michael,

Suggest you check out Common Alerting Protocol to avoid gratuitous
incompatabilities.  CAP is designed as a content framework (essentially
an XML-based data dictionary) for alerting.  E-mail is one, among many,
means of delivery of such information.  Here's the .sig from the
discussion list that should have plenty of pointers:

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On Mon, 2006-06-12 at 15:01 +0200, Michael Schmeing wrote:
> Hello all,
> 
> sorry it took so long for me to get back to you, but it has been a
> very busy time. As there appears to be some interest in at least
> discussing the draft, I will start by summarising Dan Wings´s input
> (both his submissions to the list and his suggestions he made directly
> to me) and give my view on these suggestions.
> 
> Dan´s first suggestion in his email directly to me was to use priority
> levels 0, 100, 200, 300 and 400 instead of 0, 1, 2, 3 and 4. As the
> length of the priority identifier is now limited to three digits, I
> think that is a valid suggestion. I plan to include that in the next
> version of the draft, unless someone can give good reasons to stick
> with the old scheme or use a completely new one.
> 
> Another of Dan´s suggestions in that email was to use the IANA to
> register the priority levels. He mentions that this would remove the
> problem with the Priority: and Precedence: header fields where some
> vendors use keywords and others (numerical) values.
> 
> I am not sure it is really required to register the priority levels
> with IANA basically for two reasons:
> 1. The draft (and therefore the standard if it ever comes to that)
>    defines the allowed value of the PRIORITY keyword to be only a
>    numerical value. Thus the problem with the AFAIK not standardised
>    header fields can not occur: Anyone conforming to the standard has
>    to use numerical values according to the priority policy
>    indicated. If anyone decides not to obey the standard, they would
>    not care about IANA registration either.
> 2. The provided policy is only an example. Priority policy enforcement
>    across administrative domain boundaries is difficult to say the
>    least. For the general Internet, the most that I expect to be
>    realistic is some form of Quality-of-Service, where Internet
>    Providers would transport emails (or any other content) of some
>    customers (which probably have to pay extra for this) more quickly
>    than the traffic of other customers (keyword: net
>    (non-)neutrality). They would define their own policy with their
>    own priority levels for the use of email priorities, if they allow
>    their customers to downgrade their service level on a
>    per-email/per-connection basis.
> If, on the other hand, the group feels that we should go for IANA
> registration, that is fine with me. In that case, I would just ask
> someone to provide a wording example for this, because I have never
> done it yet.
> 
> A problem Dan mentions in his email to the mailing list is the problem
> of authorisation. He asks the question of what will stop him from
> using highest priority on all emails and says that it can be solved
> within an administrative domain but probably not across them.
> 
> As I have already indicated above, I see this problem as well.
> 
> When I created the I-D, it was for a scenario of cooperating
> administrative domains and thus, this problem did not present itself:
> The domain administrations had agreed on a policy for the use of
> priorities.
> 
> Of course, one thing preventing excessive use of high priorities is
> the size limit on high-priority emails. You can not put much data in
> two or four kilobyte, so you have to use lower priorities for larger
> emails.
> 
> Other than that, I only have one rough idea so far how this issue
> could be addressed in a general case that I would like your opinion
> on: The policy could impose a frequency with which one sender may
> issue emails of the higher priorities. Together with the smaller size
> of high-priority emails that should guarantee at least some space for
> lower priority emails
> 
> 
> 
> Best regards,
> Michael Schmeing


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