[Spamassassin Wiki] Trivial Update of "Rules/MISSING_MID" by AndrewDaviel

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The "Rules/MISSING_MID" page has been changed by AndrewDaviel:
http://wiki.apache.org/spamassassin/Rules/MISSING_MID?action=diff&rev1=3&rev2=4

  The message does not contain a Message-Id header.  The relevant standards specify that mails should 
  have Message-Id headers.  All properly written Mail User Agent (or Mail Submission Agent) software is expected to add a Message-Id header.
  
+ This suggests that the mail was sent by badly-configured mailout software rather than by a normal email client.
+ 
  === Further Info ===
  
  The default scores for this rule can be found [[http://spamassassin.apache.org/tests.html|in the online list of tests]].