IsDisposable – Open-source disposable email detection (160K+ domains)
Larger blocklist than mailchecker, but disposable email detection is solved.

Email risk-scoring at signup, but Kickbox, ZeroBounce, and NeverBounce already dominate.
SaaS platforms, mobile apps, IoT services, newsletter platforms with signup flows
Kickbox · ZeroBounce · NeverBounce
Larger blocklist than mailchecker, but disposable email detection is solved.
SMTP verification beats format checks, but Kickbox and ZeroBounce already own email validation SaaS.
Cleaner UI than 10minutemail, but mail.tm already exists and has a free web app.
Autheona's pitch is practical: run real-time checks at signup (typo correction, disposable-domain detection, fraud and deliverability signals) so you can skip clumsy verification steps. The product feels focused and API-first, but the landing page and copy don't show any clear technical edge over established validators or how they avoid false positives in borderline cases.
Clean temp mail UI, but 10minutemail, Guerrilla Mail, and Tempmail already own this space.
Yet another temp mail service—per-domain blocking exists in TempMail already.