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• latency and busy systems
  Realtime Blacklists or blackholes (RBL) can introduce a high degree of latency in the delivery path of email. Particularly when a dozen or so RBL s are checked for each email.
  
  
• RBL spam filtering software
  RBL or Realtime Black Listr. How they work, and where they fit into your spam filtering strategy, and the downside of RBL's.
  
  
• Spam checking content urls
  RBLs have their problems. Checking the urls found in the contents, or body of an email is an extremely effective method of spam filtering. But how is it different?
  
  
• The downside to RBL's
  RBL servers typically have far too many bogus records to be considered reliable as a go-nogo test. But RBL servers can play an important role if used properly.