Signup Email Deliverability Sweeper

Quickly locate which link breaks when users don't receive signup emails

Problem

Developers often find they receive signup emails but some users don't, and switching SMTP providers doesn't help; users check spam with no luck. Troubleshooting spans domain authentication, blacklists, and content filters—inexperienced people are left stuck.

Solution

A tool that diagnoses the delivery chain by recipient domain: users input recipient domains and sender config, and the tool checks SPF/DKIM/DMARC, IP blacklists, filter-rule hits at major providers, returns an actionable fix list, and provides a send-log dashboard to pinpoint whether emails aren't sent or are blocked.

Users

Indie developers running signup/password-reset flows, small SaaS teams, founders using third-party email services

MVP

One-click domain auth checks (SPF/DKIM/DMARC); deliverability pre-checks for major mailbox providers; blacklist lookup; report with fix suggestions; save recent check results for comparison

Revenue

Free single check, per-domain subscription or usage-based pricing; enterprise plan with monitoring alerts

Why now

Email delivery issues are frequent and anxiety-inducing, but existing tools focus on marketing email and neglect transactional signup scenarios; low API and query costs suit indie developers