Glossary Archive

A monitored email address used to identify poor acquisition or hygiene: pristine (never used), recycled (abandoned then repurposed), typo (misspelled domains).

A general term for monitored trap addresses (pristine, recycled, typo) used to identify senders with poor acquisition or hygiene.

A major blocklist operator whose datasets are widely used by mailbox providers and security filters to identify spam sources.

A targeted phishing attempt aimed at specific individuals (often high-value) to compromise accounts or defraud an organization.

Spoofing is the forging email identity so a message appears to come from another sender/domain, often used in phishing and fraud.

A prefix added to a domain (e.g., mail.example.com) used to separate traffic, branding, or functions and manage reputation at a finer granularity.

The act of joining a mailing list (via form, email request, or offline consent). A subscriber is someone who requested to receive messages.

A rule that suppresses or removes long-term unengaged recipients after a defined period to protect deliverability (a type of sunsetting).

A defined process for removing or suppressing unengaged recipients over time to protect reputation and improve inbox placement.

A do-not-send list of addresses that must be excluded from sends (e.g., unsubscribes, hard bounces, complainers, legal suppressions).