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About InboxPreflight

InboxPreflight is a web-based tool that checks email deliverability before messages are sent. It analyzes sending domains and email content for authentication and spam-trigger issues, including SPF, DKIM, DMARC, MX records, and message headers. The service runs checks directly in the user's browser without requiring signup or storing email content on its servers. Results are presented in a dashboard with a 0–100 preflight score, prioritized plain-English explanations, and suggested fixes. Users can re-run checks after applying changes to confirm improvements before launching campaigns.