- In order to make use of ADSP, Y needs to change which MTA it's
using. This is almost certainly an expensive effort.
- Y simply can't use ADSP.
- The DKIM reporting extensions should have a flag that says DSNs
should not cause generation of fraud reports.
I'll take "none of the above", Alex.
I've seen a enough spam masquerading as DSNs that I really wouldn't
want to give DSNs a free pass. I also think that history has not been
kind to people who made permanent changes to standards to work around
temporary software limitations. If the MTA can't sign its DSNs, that's
a bug, no matter how popular it is. (Come to think of it, my MTA has
the same issue, although since I will never publish dkim=all, it's
not functionally a bug.)
If people are serious about signing all their mail, they should sign
all their mail. Maybe they'll switch MTAs, maybe their popular MTA
will eventually fix the DSN signing bug, and then they can publish
dkim=all.
R's,
John
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