Free tool

Check email syntax before signup

Validate RFC-aware syntax, TLDs, and common formatting mistakes before an address hits your database.

Why this signal matters

Syntax validation is the first gate in any signup or lead-capture flow. Catching malformed addresses before they reach your database keeps CRM data clean and avoids wasted sends. Invalid TLDs, missing @ symbols, and disallowed characters are common sources of bad rows—especially when users paste addresses from spreadsheets or autofill.

Related tools

Full Email Validator
Run the complete detection stack—syntax, normalization, role, public, relay, and disposable—in one pass.
Disposable Email Checker
See whether a domain is on our disposable list or resolves as a throwaway provider via live DNS.

Need volume, webhooks, or team access?

The same detection stack powers the EmailGuard API. Start free, then scale with scoped API keys and predictable rate limits.

Start validating free View API docs