Hi, I posted some feedback on the proposed SPF modifiers on the MARF IETF list.
Here are my relevant-to-SPF comments:
=======================================
- I'm having a hard time understanding how the SPF "reportopts" will be used.
The publisher of the record adds the policy piece of SPF that leads to a (fail,
softfail, neutral) result, usually by adding something like "-all" or "~all" to
their record.
EG, using the proposed syntax, I could write "v=spf1 ip4:1.2.3.4
report=email.address reportopts=f ~all". This would specify that I want reports
on all SPF "fails" (distinct from "softfails"). However, my "~all" means that
all my non-authorized email will end up receiving "softfails", resulting in me
receiving zero reports.
- Lots of real-world SPF records "include:" other records. What if two
report-related extensions appear due to the use of include:?
- SPF records describe "mechanisms" for identifying authorized servers and
"modifiers". The extensions are "modifiers", but I'm uncertain if these will
break existing SPF code, or if various implementors did the right the thing.
- "reportsmtp=" is redundant with SPF's existing "exp:" modifier.
=======================================
Overall I like the idea of adding a feedback mechanism to SPF. I'm keen on
fleshing out exactly what is useful and possible, and then using that
experience to improve SPF. So, add "feedback mechanism" to the
SPF-improvements bucket.
Cheers,
=- Tim
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