About Us
About WarmupSleuth
We are on a mission to make email deliverability accessible to every business, from solo founders to enterprise agencies.
Our Mission
Email is the backbone of business communication, yet too many legitimate senders struggle with deliverability. Spam filters penalize new accounts, misconfigured DNS silently kills campaigns, and sender reputation takes months to build manually.
WarmupSleuth was built to change that. We combine AI technology with a proven 4-phase warmup methodology and a network of 10,000+ senders to help teams of all sizes build and maintain a stellar sender reputation -- automatically.
Making email deliverability accessible to every business means offering a generous free plan, 11 free tools, transparent pricing, and the most comprehensive API in the industry.
Our Values
Innovation
We leverage AI and cutting-edge technology to solve email deliverability challenges that traditional tools cannot address. From GPT-4 email generation to real-time reputation scoring, we push boundaries.
Security
Your data security is non-negotiable. We use AES-256-GCM encryption, Argon2id password hashing, 2FA/TOTP, and TLS 1.3 in production. Full GDPR compliance with audit logging for all critical actions.
Transparency
No hidden fees, no opaque algorithms. Our pricing is clear, our reputation scoring is explained, and our API is documented with 300+ endpoints. You always know exactly what you are paying for.
Customer-First
Every feature we build starts with a customer need. Our free tools, generous Free plan, and responsive support reflect our belief that great products earn loyalty through value, not lock-in.
Our Team
WarmupSleuth is built by a distributed team of email deliverability engineers, full-stack developers, and security experts who have collectively managed billions of email sends.
Team profiles coming soon.
By the Numbers
87,000+
Lines of Code
321
API Endpoints
9
Email Providers
37
Database Models
11
Free Tools
14
Background Workers