2. The method of claim 1 , wherein collecting attributes of the web site to which an email address was submitted comprises: collecting one or more primary attributes describing the web site; and collecting one or more secondary attributes derived from the primary attributes.
2. The method of claim 1 , wherein collecting attributes of the web site to which an email address was submitted comprises: collecting one or more primary attributes describing the web site; and collecting one or more secondary attributes derived from the primary attributes. 3. The method of claim 2 , wherein the primary attributes describing the web site comprise at least one of an Internet Protocol (IP) address and a Domain Name System (DNS) name of a web server hosting the web site.