Windows Live Mail - SPAM that is not SPAM

Windows 7 Home Premium. Windows Live Mail 2011. The Subject Title of all incoming Emails is preceded by the word "SPAM" ................... whether it is from a known/reliable source or an unwanted originator. When the Email is forwarded on then the title becomes "SPAM. SPAM and then the original subject" .... e.g. "Help" becomes "SPAM. Help" ... becomes "SPAM.SPAM. Help". This has been going on for 3 weeks.
 
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