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From bugzilla-dae...@spamassassin.apache.org
Subject [Bug 7831] New: DKIM_VALID_AU does not get set properly when mailing from a subdomain
Date Sat, 27 Jun 2020 01:07:35 GMT
https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7831

            Bug ID: 7831
           Summary: DKIM_VALID_AU does not get set properly when mailing
                    from a subdomain
           Product: Spamassassin
           Version: SVN Trunk (Latest Devel Version)
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: Plugins
          Assignee: dev@spamassassin.apache.org
          Reporter: nyt-apachebz@countercultured.net
  Target Milestone: Undefined

RFC6376[1] states that mail authored from a subdomain of the domain specified
by d= in the DKIM signature are valid unless t=s is set in the DKIM DNS record.

Spamassassin's DKIM plugin fails to handle subdomains correctly, only checking
the sender against the domain specified in the DKIM mail header.  This causes
DKIM_VALID_AU not to be set when there is a valid signed DKIM message.

[1] https://tools.ietf.org/html/rfc6376#section-3.10

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