RFC 7489 was published last month.  Using zdkimfilter 1.5 it is easy to meet
DMARC minimum implementation requirements --section 8 of the RFC.  That section
stresses the ability to send and receive reports, which is the most noteworthy
addition with respect to ADSP.  It makes mail servers of different domains
interact with one another.  Now, I'm not so clever as to tell exactly what
should be memorized and for how long, but I'm more and more convinced that a
database of peers is necessary for SMTP to operate sensibly.

Personally, I BCC outgoing DMARC reports to myself, and read them using the
XSLT at http://www.tana.it/sw/dmarc-xsl/.  When I get the feeling that only
phishes fail DMARC check, I enable DMARC for that domain.  ADSP can be enabled
 per domain too, in the new version.  In the other cases, when DMARC fails
amiss, I'm comforted that remote domains hear my voice, however statistically
irrelevant it may be.  For incoming reports, there is no way to publish
per-domain policies, so there's not much to decide.  I'm open to suggestions.

Version 1.5 also fixes a couple of issues, long From:, garbled logs.  There are
some additional requirements, see release notes.

Feel like giving it a try?
http://www.tana.it/sw/zdkimfilter/

Ale

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