This suggests attempting an exercise. The exercise is to try to document the
boundaries for using ADSP. It requires being careful in describing failure
scenarios and careful is assessing their likelihood.
As for attempting careful caveats so far, they are scattered around:
<http://dkim.org/specs/draft-ietf-dkim-deployment-11.html#rfc.section.7.3>
We put some warnings in RFC 5617, Appendix B, including this one:
B.5. Domains with Independent Users and Liberal Use Policies
When a domain has independent users and its usage policy does not
explicitly restrict them to sending mail only from designated mail
servers (e.g., many ISP domains and even some corporate domains),
then it is only appropriate to publish an ADSP record containing
"unknown". Publishing either "all" or "discardable" will likely
result in significant breakage because independent users are likely
to send mail from the external paths enumerated in Appendix B.1.
R's,
John
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