Dkim filter adsp evaluation tool
opendkim-testadsp domain [...]
opendkim-testadsp retrieves the author domain signing practises (ADSP) record for one or more domains from DNS and prints the result in a human-readable format.
This man page covers the version of opendkim-testadsp that shipped with version 2.9.2 of OpenDKIM.
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Copyright (c) 2009, 2011, 2012, The Trusted Domain Project. All rights reserved.
RFC5617 - DKIM Author Domain Signing Practises
RFC6376 - DomainKeys Identified Mail