Glossary Archive

A sending IP reserved for a single organization, enabling more direct control over IP reputation compared to shared pools.

Software that unifies customer data from multiple sources into a single customer profile for analytics and activation (behavioral, transactional, demographic).

A system for tracking and managing relationships with current/prospective customers (contacts, deals, activities, notes) in a centralized database.

Distributed Denial-of-Service: flooding a system with traffic from many sources to disrupt service; in email, can include automated signup flooding to overwhelm a target inbox.

A sending IP used by a single sender/organization, giving them more direct control over IP reputation (vs shared pools).

A temporary delivery delay (often 4xx) caused by transient technical issues or reputation/rate limits; may be retried until it delivers or expires.

The ability of email to reach the inbox (including inbox tabs) rather than being blocked or filtered to spam. Often assessed via inbox placement tests and reputation signals. Often contrasted with delivery: deliverability focuses on inbox placement (inbox vs spam) after the message is accepted by the receiving server.

A conceptual inbox/primary placement rate (inbox placement). It’s difficult to measure precisely at scale because mailbox providers don’t universally report inbox vs spam.

A metric indicating messages accepted by the recipient’s mail server (delivered to inbox or spam), typically calculated as sent minus bounces. Delivery/acceptance does not guarantee inbox placement; messages may be delivered to spam/junk.

Acceptance by the recipient’s receiving system (mailbox provider for email, carrier for SMS). Delivered mail may still land in spam/junk.