Dave Crocker <dhc(_at_)dcrocker(_dot_)net> wrote:
In particular, what is the meaning of having no record for an IP
address? Does it mean that it is not authorized or does it mean that we
do not know?
http://www.ietf.org/internet-drafts/draft-irtf-asrg-lmap-discussion-00.txt
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1.2. Interpretation of LMAP Data
Recipient MTAs are free to interpret LMAP data as they wish.
Possibilities range from rejecting email with a 550 error code
to using LMAP data as one input to a multi-criterion filter.
Domains may also optionally use LMAP data to whitelist or give
higher passing values for email in their filters.
E-mail from LMAP domains that do not publish LMAP data should
NOT be rejected ...
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That text could be clearer. Any future revision of the document
will discuss the issues you have raised, hopefully in a more
understandable fashion.
A receiving MTA might treat the former with less caution and the latter
with more. Neither, however, gets automatic trust, because registration
as an MTA does not guarantee that the operator of the MTA is not a
spammer...
Exactly. I will be adding text similar to the above comments in
future versions of the document.
Alan DeKok.