Directory Harvest Attacks (DHAs) are a sophisticated technique that spammers use to bypass typical email server checking mechanisms in order to access directories and receive a list of valid email addresses. During a DHA, spammers attempt to deliver messages to multiple addresses, such as,, and Addresses that are not rejected by the receiving mail server are determined as valid. These addresses are compiled and sold to other spammers worldwide. This is why a brand new email box can be full of unsolicited, junk email just hours after it has been set-up.


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