You can safely assume that
- any message that carries "ADV" in it subject is spam
and set up a filter that either deletes it or puts it in your "Possible Spam" folder.
Mail with "ADV" in the Subject is Spam
By Heinz Tschabitscher, About.com
Based on some legislative attempts to control spam, spammers sometimes include "ADV:" at the begging of the subject line to make their unsolicited message appear legitimate.
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