On Wed, Feb 04, 2004 at 04:28:07PM -0800, Hallam-Baker, Phillip wrote:
|
| > The defined behaviour is:
| >
| > Unknown mechanisms cause processing to abort with the result
| > "unknown".
|
| Is it possible to allow this behavior to be selectable?
|
| So that the domain owner could select 'abort' unkown or continue to see if
| there is anything else that might work?
|
We could consider a "degraded mode" but it becomes very icky very quickly.
You need to keep in mind that you're in degraded mode so that when you
hit -all you turn the "-" into "?".
And it becomes difficult to do negatives, eg. you want to say
v=spf1 a mx -a:bad.com +a:good.com -all
But instead of -a:bad.com you actually want -newmech:bad.com
v=spf1 a mx -newmech:bad.com +a:good.com -all
If "newmech" doesn't trigger an abort, there might be problems with
letting through what shouldn't have been let through ...
... There will be problems either way.
You're right, it is definitely nice to be able to continue to see what
else might work. But people can put the most-likely-to-be-supported
mechanisms up front and only put the experimental ones behind.
I mean, given a situation
v=spf1 a mx unsupported1 unsupported2 -all
there's not actually that much difference between
just aborting "unknown" when you encounter "unsupported1"
and
not grokking either of the two unsupported* and returning a
degraded-mode "unknown" upon "-all".
I doubt we'll see many installations where people say "a mx smime
domainkeys" though I could be wrong. More common would be just one new
auth mechanism.
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