Allison Randal at Radar O'Reilly in an article entitled "Spamonomics 101" recieved this useful bit of insight from Ken Simpson of MailChannels an Email Security Solutions Company,
Ken Simpson says:
"Those messages are sent by spammers to poison the spam filters. When someone receives a message full of gibberish and reports it as spam, the spam filters tune themselves to recognize gibberish as spam—which reduces their overall accuracy."When your cleaning your E-mail In-box, check the content of mail you'd usually not even look at. If it's gibberish as noted above don't SPAM it; DELETE instead.