Canning spam, Question No. 6

Answer from the SearchSecurity.com glossary:
A directory harvest attack can use either of two methods for harvesting valid e-mail addresses. The first method uses a brute-force approach to send a message to all possible alphanumeric combinations that could be used for the username part of an e-mail at the server, up to and including those of length n characters (where n is some preset positive integer such as 15). The second and more selective method involves sending a message to the most likely usernames -- for example, for all possible combinations of first initials followed by common surnames. (Read the rest of the definition.)

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