Knowledge Base


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Check out or glossary of 135 common email marketing and deliverability terms.

New User Guide

Just getting started? Find information on specific products as well as account basics.

API Version 2

Access version 2 APIs including Design, Prospect, Validation, and Google Postmaster Tools.

API Version 1

Access the legacy API documentation for Inbox, Reputation, DMARC, Analytics, and Account Services.