2. The method as recited in claim 1 , wherein defining a model relating to prior transmission of email comprises defining a model relating to the transmission behavior of an attachment to said prior emails transmitted through said computer system.
2. The method as recited in claim 1 , wherein defining a model relating to prior transmission of email comprises defining a model relating to the transmission behavior of an attachment to said prior emails transmitted through said computer system. 3. The method as recited in claim 2 , wherein said method further comprises extracting said attachments from each of said selected emails transmitted through said computer system.