Page 20 - Accelerating Sales in Cisco Content Security - ASCCSv9

Spam Techniques – Arms Race

 Message digests  Rate limiting
 Random words  Larger botnets

 Bayes  Reputation
 Random phrases  Legitimate email accounts / legitimate hosts

 IP blocklists  DKIM / SPF
 Botnets  Spammers: Enthusiastic adopters!

 Spam signatures
 Random messages / image spam

Latest Trend

Snowshoe Spam