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Auto-responders Bounce Backs Bounce Rate Call to Action Click-through Click-through rate Commercial Email Message Data Mining Demographic Double Opt-In Double Opt-Out Express Consent False Positives Format	From Name Hard Bounce Inferred Consent List Broker List Building List Host List Manager Look and Feel Multi Part OLAP Open Rate Opt-in Opt-out Permission Marketing	Personalisation Privacy Rental list Segmentation Sniffer Technology Soft Bounce Spam (or UCE) Spam Filter Subject Line Suppression List Tracking Unique Click Viral Marketing

Bounce Backs A bounce back email is an email that has been sent back to the server that sent the email. Email bounces are generally called a "hard bounce" or a "soft bounce." A hard bounce means the email could never get through to the intended recipient because, for example, the domain name doesn't exist or the specific recipient at that domain doesn't exist. A soft bounce means the email didn't get through this time for some temporary reason, for example a full mailbox or the recipient's mail server is down.