Apparently this warning was useful to discover a bug, corrected upstream: <https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7369> <https://svn.apache.org/viewvc/spamassassin/branches/3.4/lib/Mail/SpamAssassin/PerMsgStatus.pm?r1=1790926&r2=1791013&pathrev=1791013&diff_format=h>
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