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hard bounce

A hard bounce is an e-mail message that has been returned to the sender because the recipient's address is invalid. A hard bounce might occur because the domain name doesn't exist or because the recipient is unknown. When the recipient's name is known, e-mail may be rejected because the sender's mail box is full or for other reasons. This is known as a soft bounce .

See bounce e-mail .

This was last updated in September 2005

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Here's a site that has some statistics on bounce rates and the bounce error codes.

http://www.unlocktheinbox.com/resources/bounces/
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