Clean lists. Better delivery. Lower cost.
Esigil builds fast, privacy-first email verification for teams who want enterprise quality without enterprise pricing. Validate, score, and act on email health — in seconds, on demand.
Our story — built for people who clean data
Frustration with costly verification
Founders wasted budget on pay-per-lookup tools with limited accuracy. They decided there had to be a better way — cheaper, private, and open to small teams.
Built a privacy-first engine
We focused on multilayer verification but avoided long-term data retention. Results matched enterprise providers during internal benchmarks.
Esigil launches
Public launch with transparent pricing, free trial credits, and strict privacy defaults: verification data auto-deletes after configurable retention windows.
Accuracy First
Multiple checks, layered logic, and live threat feeds to maximize deliverability confidence.
Privacy by Default
We retain minimal metadata and offer automatic deletion windows so your lists stay yours.
Fair Pricing
No surprising fees. Monthly plans and simple top-ups so you pay only for what you use.
How the engine works (high level)
- 1. Quick format & syntactic checksRejects malformed addresses instantly without external calls.
- 2. DNS & MX verificationChecks domain records and MX routing — adaptive logic for greylisted or rate-limited hosts.
- 3. Mailbox probing & reputational signalsNon-intrusive mailbox checks combined with spam-trap and disposable provider lists.
Developer snapshot
# Single verify (example) GET https://api.esigil.com/verify?email=user@example.com Authorization: Bearer YOUR_API_KEY # Response: concise JSON with flags (valid_format, valid_mx, mailbox_exists, is_temp, is_risky)