Inbox Insight tests outbound email by sending campaign samples to a managed seed list spanning Gmail, Outlook, Yahoo, and dozens of other global mailbox providers, then reports whether each message landed in the inbox, the spam folder, or a tab. Each test returns a spam score evaluated against filters including SpamAssassin, Barracuda, Microsoft Exchange Online Protection, Proofpoint, and a Google filter, together with IP-level analytics such as sender scores and blocklist presence and domain-level analytics including DKIM alignment.

The product is sold on subscription plans with a credit-based model and adds automatic and scheduled tests, mailbox integrations for Gmail, Mailgun, SendGrid, Outlook, Mailjet, Klaviyo, HubSpot and others, PDF and white-label report exports, and programmatic access through the GlockApps API. A free public spam checker lets prospective users run a quick placement test without an account.