http://wiki.apache.org/spamassassin/Rules/DKIM_ADSP_CUSTOM_MED
If you look at the DKIM configuration files, you'll see that the ADSP
usage is almost entirely faked up, via a list of entries for the usual
phish targets (ebay, paypal, etc.) to pretend that they have ADSP
records:
http://svn.apache.org/repos/asf/spamassassin/trunk/rules/60_adsp_override_dkim.cf
This tells us that while dropping unsigned mail purporting to be from
famous phish targets is generally a good idea (something I've always
agreed with), ADSP records in the DNS aren't a useful way to make that
happen.
R's,
John
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