A method includes steps of receiving an email message comprising a plurality of packets and delivery-path information; determining a path for the email using the delivery-path information; comparing the path with a plurality of prior email paths; determining a measure of similarity between the path of the email received and one or more of the plurality of prior email paths; and determining a spam score for the email received, based on the measure of similarity. Other embodiments include a computer readable medium comprising computer code for performing the above function and an information processing system including a processor configured (i.e., hard-wired or programmed) to perform the method.

 
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