Executive Summary

Email delivery failures are a frequent, expensive pain for product and infrastructure teams at mid-market and enterprise companies—issues that can take hours or days to diagnose because inbox providers expose limited telemetry and ESPs surface opaque error codes. Deliverability engineers, backend developers, and ops teams lose revenue and trust when transactional messages or critical notifications are delayed or blocked, and many organizations lack reproducible, internal tooling to trace a message from SMTP transaction through provider heuristics to the inbox or spam folder. You could build an open-source deliverability debugger: a reproducible sandbox that replays SMTP sessions, parses bounces and headers, verifies DKIM/SPF/DMARC, simulates provider heuristics, and links to ESP logs and DNS records, with CI-friendly commands and optional enterprise plugins for secure on-prem use. The market looks attractive now—estimated at $6.0B (1.0M addressable businesses × $6K ACV), with a Market Score of 92/100 and Revenue Potential 86/100—because tightening inbox heuristics and the rise of programmatic transactional email are increasing demand for transparent, inspectable tooling that teams can run themselves. This project’s advantages are clarity, extensibility, and privacy: open-source lets teams audit rules, add provider-specific heuristics, and run diagnostics behind corporate firewalls, while a dual model (free core + paid enterprise support or managed hosting) targets the $6K ACV buyers. Real challenges include sustaining an active maintainer community, keeping rulesets current with evolving provider signals, and competing against established SaaS ESP analytics; success will require strong integrations with major ESPs, a clear support/SLAs offering, and demonstrable reductions in mean time to repair (targeting hours instead of days). If you can solve those operational and go-to-market hurdles, this tool addresses a clear, growing need and can capture enterprise buyers who value control and auditability over opaque SaaS.

Executive Summary

Market Opportunity

Fix email delivery failures fast with an open-source deliverability debugger targets a $6.0B = 1.0M businesses x $6K ACV (enterprise + mid-market deliverability/ESP tooling and analytics) total addressable market with medium saturation and a year-over-year growth rate of 10-15% CAGR for email infrastructure and deliverability tooling.

Key trends driving demand: Inbox-provider tightening -- stricter spam/phishing heuristics increase need for debugging tools; Rise of transactional & programmatic email -- more business-critical sends demand reliability; Open-source adoption in infra -- dev teams prefer extensible, inspectable tools they can run internally; AI for log analysis -- enables automated, scalable root-cause detection from noisy SMTP/header data.

Key competitors include Mailtrap, MailHog (open-source), GlockApps, MXToolbox, Postmark (Wildbit).

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Fix email delivery failures fast with an open-source deliverability debugger

Executive Summary

Fix email delivery failures fast with an open-source deliverability debugger

Executive Summary

Market Validation

Market Opportunity

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