How does the AOL Spam Filter work?
By marking messages as Spam or Not Spam you are customizing your personal Spam filter to learn what is spam and what is not.
AOL spam controls filter email for possible spam, even before the mail reaches your Inbox or Spam Folder. This system is largely reputation-based, so senders with good reputation will have their email delivered (at which point, your personal filters will perform the extra filtering). Emails from senders with bad reputation are blocked. If our Global Filters decide to block an email, we return the message to the sender with a mailer-daemon error explaining why the email was returned.
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