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Pre-send deliverability auditor and spam filter shield for independent newsletters
Acute hair-on-fire problem
Total addressable market
Defensible wedge opportunity
Execution feasibility
Writers on Substack and Beehiiv routinely lose 15–25% of their organic open rates because Gmail and Outlook demote newsletters to Promotions or Spam without warning due to trigger keywords, unverified tracking domains, or high image-to-text ratios.
Independent newsletter publishers, Substack creators, media collectives (5K+ subscribers)
Gmail and Yahoo's mandatory 2024 DMARC/DKIM email sender requirements established strict 0.3% spam rate ceilings, causing massive hidden delivery drops for non-technical creators.
“My newsletter open rate plunged from 47% to 19% overnight on 18,000 subs. Took me two weeks to realize one affiliate link domain was blacklisted by Microsoft Defender.”
“Is there any tool that scans a Substack draft before sending and warns if it's going to trigger Gmail's Promotions tab? Mailchimp has inbox preview but Substack has nothing.”
Freemium with 2 free checks/month. Pro plan at $29/month for unlimited pre-send audits, automated inbox placement testing (Gmail, Apple Mail, Outlook), and domain reputation alerts.