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A hard bounce is logged when there is an attempt to deliver an email message but the delivery is rejected due to a permanent error, such as an invalid email address. The most common cause of email bounces is a typo in the email address. A soft bounce is logged when an email is sent, processed by the subscriber�s server and then the message is returned. Soft bounces may occur if the server is not available or if the mailbox is over its size limit.

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