Verify email deliverability with confidence.
LeoVerifier is a self-hosted email verification API — syntax, MX, SMTP, disposable and role detection — with API keys, per-plan quotas, and rate limiting built in.
Accurate checks
Syntax, MX, SMTP probing, catch-all, disposable and role-address detection with a normalised confidence score.
Secure by default
Hashed API keys, single-use magic links, session cookies, CSRF and rate-limit protection, and strict security headers.
Quotas & usage
Per-plan monthly quotas and rate limits, live usage tracking, CSV export, and an admin panel to manage it all.
How it works
From provisioning to your first verified address in three steps.
Get provisioned
An admin creates your account and you receive a one-time magic-link sign-in by email.
Create an API key
Generate a live or test key from your dashboard. Keys are shown once and stored hashed.
Call the API
Send emails to verify.leomail.xyz/api/v1/verify and get structured, scored results in JSON.