Section 6.8 proposes a binding between List-Post and the signing domain:
A signing MLM could add a List-Post: {DKIM 12} header field (see
[LIST-URLS]) using that DNS domain matching the one used in the "d="
tag of the DKIM signature that is added by the MLM. This can be used
by {DKIM 12} verifiers or receivers to identify the DKIM signature
that was added by the MLM. This is not required, however; it is
believed the reputation of the signer will be a more critical data
point rather than this suggested binding. Furthermore, this is not a
binding recognized by any current specification document.
Proposed replacement (rewording + List-Id addition):
A signing MLM can make its role apparent by properly choosing the
signing domain, the one used in the "d=" tag of the DKIM signatures
added by the MLM. Recognizing the role of a signer can be important
for inferring the semantics of any signed content. Two criteria are
as follows:
* A signature can be identified as pertaining to an aliasing or
resending MLM if the domain-part of the List-Post field matches
the signing domain.
* When no List-Post field is present, a signature can be identified
as pertaining to an authoring or digesting MLM if the right part
of the List-Id matches the signing domain.
These criteria are not required, however; it is believed the
reputation of the signer will be a more critical data point rather
than these suggested bindings. Furthermore, these bindings are not
recognized by any current specification document.
_______________________________________________
NOTE WELL: This list operates according to
http://mipassoc.org/dkim/ietf-list-rules.html