Email Verification API
Validate every address in real time and block disposable, invalid, and trap emails at signup.
Data Enrichment · Free forever
Free Email Syntax Checker
Prevent Typos at Signup
Test RFC-compliant email syntax validation, typo detection, and suggestion API for signup forms.
Run the tool
This tool performs a live lookup (DNS, WHOIS, or a page fetch) that a browser cannot do on its own, so the value you enter is sent to our server for that check. It is not stored. If the lookup is unavailable, the tool falls back to its offline formula and tells you.
Under the hood
How this tool works
No black box. This is the exact logic the tool runs on every input you give it.
Formula
Valid = RFC 5322 local-part ∧ labelled domain ∧ TLD ≥ 2 chars ∧ length ≤ 254
- 1
Check RFC 5322 syntax on the local part, the domain labels, and the TLD.
- 2
Classify the domain: corporate, free provider, disposable, or parked.
- 3
Detect role addresses (info@, sales@, admin@) that rarely reach a human.
- 4
Combine the signals into a verdict — valid, risky, or invalid — with the reason attached.
Need this at scale?
Two Govarova products that do this automatically
The free tool handles one input at a time. These handle millions — verified, enriched, and ready to send.
Govarova Outreach
Run multi-step cold email cadences with AI personalisation, tracking, and a built-in CRM.
More free data enrichment tools
Register & start — free
Run Free Email Syntax Validator API Demo as often as you like. When you are ready to do it across your whole market, Govarova is waiting.