https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6988

            Bug ID: 6988
           Summary: __HAS_MIMEOLE triggers FP on legitimate message with
                    non-Microsoft X-MimeOLE header
           Product: Spamassassin
           Version: 3.3.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Rules
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 5177
  --> https://issues.apache.org/SpamAssassin/attachment.cgi?id=5177&action=edit
Lightly anonymized header demonstrating the FP

A message reported mistagged as spam hit on TO_NO_BRKTS_MSFT.  Digging down
through the meta parts I found overlapping subrules __HAS_MIMEOLE and
__MIMEOLE_MS.  __HAS_MIMEOLE will always fire if __MIMEOLE_MS does, but in this
case a third party appears to be legitimately putting their own mailer info in
the X-MimeOLE header.

I suggest removing __HAS_MIMEOLE from __TO_NO_BRKTS_MSFT to narrow the focus to
messages that really were (supposedly) generated by Microsoft mail clients
instead of any mailer that uses an X-MimeOLE header.

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