Glossary Archive

A challenge-response control on forms to reduce automated/bot submissions and abuse (e.g., signup flooding).

Canada’s Anti-Spam Legislation, governing commercial electronic messages and requiring consent and compliant identification/unsubscribe practices.

California Consumer Privacy Act: grants California residents rights to know, access, delete, and opt out of certain uses/sale of their personal information.

Customer Data Platform: software that unifies customer data from multiple sources into centralized profiles for analytics and activation.

A click engagement rate, commonly calculated as unique recipients who clicked at least one link divided by recipients who received/delivered the message.

The percentage of delivered emails where recipients clicked at least one link (often measured as unique clicks ÷ delivered).

The ratio of unique clicks to the total delivered emails (or recipients), expressed as a percentage. Measures direct link engagement.

Unique clicks divided by unique opens, expressed as a percentage. Less reliable when open tracking is inflated (e.g., Apple MPP).

A domain used to track clicks by rewriting links to redirect through a tracking host; can be shared (ESP-owned) or custom (sender-owned).

When an email client shows only the top portion of a long email and requires an extra click to view the rest (commonly Gmail), which can affect tracking and UX.