Click on any of the terms below to see its meaning:
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

Double Opt In Double opt-in is a two-step process to enable a recipient to subscribe (opt in) to your email list. After initially signing up the recipient is sent an email to confirm it was really them registering and they really do want to subscribe.