Short for Directory Harvest Attack, DHA is a type of
malicious Internet attack where online spammers
collect valid e-mail address and target those
addresses in a spam attack or sell the lists of valid e-mail addresses to
unscrupulous marketers. In a DHA attack, the spammer will select a domain name,
for example, Webopedia.com. The spammer then sends an e-mail to any
possible addresses within that domain name. If
the e-mail server doe not reject the e-mail,
the spammer knows it is a valid e-mail address and adds it to his target list.
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