InboxShield – Email deliverability self-diagnosis

Helps indie developers and small teams diagnose why activation emails land in spam and get actionable fixes.

Problem

Indie developers sending product activation emails find that anything with a link gets bounced to spam, and trying plain text, HTML, or no hyperlink doesn't help. They worry about domain health but don't know where to start. Existing tools are either built for large ESPs or give vague spam scores without concrete fix steps for small teams.

Solution

InboxShield is a self-serve email deliverability diagnosis tool: users enter their sending domain, DNS records, and email sample, and the system automatically checks SPF, DKIM, DMARC, blacklists, link reputation, and content triggers, then generates a prioritized fix list. Weekly re-tests push domain health score changes to help teams maintain sender reputation.

Users

Indie developers, small SaaS teams, and founders doing cold outreach and email activation.

MVP

One-click SPF/DKIM/DMARC check with visualized configuration issues; upload or paste EML samples to analyze link reputation and spam trigger words; a prioritized 'what to fix first' checklist; weekly domain health report via email; basic score visible without signup.

Revenue

Free basic checks, paid subscription for fix guidance and continuous monitoring ($9–19/mo); one-time deep audit report ($49); affiliate partnerships with ESPs.

Why now

Email remains a key channel for indie product activation and retention, but mailbox providers are tightening filters. Small teams lack dedicated deliverability engineers and need affordable self-serve tools.