Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs
2010-09-27 13:11:34
On 27/Sep/10 17:07, John R. Levine wrote:
Good point. So it's two things, lists should sign outgoing mail, and
discard any incoming mail with dkim=discardable.
No, they should reject the email at SMTP time. The email is NOT
discardable when it arrives at the MLM. Rejection at SMTP time does
no harm, and gives the sender an opportunity to fix the problem.
+1 for the idea, but...
OK, so during the SMTP session, more particularly during the interval
between receiving the dot at the end of data and returning a status
code, my SMTP daemon needs to:
* identify recipient addresses that are mailing lists
... that's not quite feasible, since your MLM doesn't have to tell
your MTA what of a particular kind of user it is. So let's say at
SMTP time the MTA accepts the message, possibly flagging it with
dkim-adsp=pass in the A-R field.
Now the MLM does its editing job. It knows the original message was
signed, so it makes sense to verify if the signature is still good
after any changes have been applied. In case verification fails, it
shouldn't try to distribute an adsp-breaking message, so it can either
send back a bounce or drop it.
Going for the bounce is not a bad design decision, because after all
these are signed messages from verified subscribers.
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- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, (continued)
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Dave CROCKER
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Mark Delany
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Murray S. Kucherawy
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, John R. Levine
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Murray S. Kucherawy
- Re: [ietf-dkim] envelope signatures, was Corner cases and loose ends, John Levine
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Michael Deutschmann
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Ian Eiloart
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Ian Eiloart
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Hector Santos
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs,
Alessandro Vesely <=
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Ian Eiloart
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Graham Murray
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Steve Atkins
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Ian Eiloart
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, John R. Levine
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Scott Kitterman
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, John Levine
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Murray S. Kucherawy
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Charles Lindsey
- Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs, Steve Atkins
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