Email Syntax Validator
Check if an email address has valid syntax. Instantly detect formatting errors, invalid characters, and common typos.
Check email syntax
An email syntax validator checks whether an address is formatted correctly under RFC 5322: a valid local part, one @ symbol, a real domain structure, and a TLD. This free tool checks as you type and flags common typos like gmial.com. Syntax is only step one; a well-formed address can still bounce, so verify deliverability before sending.
Used by 1,500+ GTM teams
Who uses the Email Syntax Validator?
Teams across go-to-market rely on clean, verified data. Here is where this tool fits.
Sales teams
Stop wasting reps' time on dead leads and bad data before outreach.
Marketers
Clean lists before a campaign to protect deliverability and spend.
Recruiters
Confirm candidate contact details are real before reaching out.
Founders
Validate key contacts before emailing partners, investors, or buyers.
RevOps
Keep the CRM accurate so routing, scoring, and reporting hold up.
Agencies
Double-check client data before it ever touches a live campaign.
How Does This Tool Work?
Before you send an email, make sure the address is formatted correctly. com'. It's a quick first check, for full deliverability verification, use Cleanlist's email verification service.
Which Free Email Lookup Tools Work Together?
Free, purpose-built tools that work together. Start from a name, a domain, an email, or a block of text, and move to a verified contact.
Email Verifier
Go beyond syntax: check deliverability with DNS, MX, and bulk CSV checks.
MX Lookup
See the mail servers and SPF setup behind any sending domain.
Domain Validator
Confirm a domain resolves and has valid MX records to receive mail.
Email Extractor
Paste any text or HTML and pull out every email address, deduped and ready to export.
What Can the Full Platform Do in 5 Minutes?
This free tool is the tip of Cleanlist. Watch a real ICP search go from query to enriched, validated, CRM-ready list in under five minutes. 36 leads, 100% contact fill, synced to HubSpot.
36 ICP leads, 100% contact fill, validated and pushed to HubSpot in one flow
Syntax is step one. Verify deliverability free.
Valid format doesn't mean it lands. Cleanlist runs full SMTP and catch-all checks in bulk across 15+ providers. 30 free credits, no card.
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Scale
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Which Cleanlist Plan Do You Need?
| Feature | Free | Starter | Pro | Scale |
|---|---|---|---|---|
Data Enrichment | ||||
| Enrichment | ||||
| AI Search | ||||
| Chrome Extension | ||||
| CSV Upload | ||||
| Credit Rollover | ||||
Prospecting | ||||
| Find People | ||||
| Sales Navigator | ||||
| Manual Entry | ||||
| Export CSV | ||||
| Leads per List | 100 | 2,500 | 2,500 | Unlimited |
| Seats included | 1 | 2 | 5 | 10 |
| Additional seats | — | $20/seat | $20/seat | $20/seat |
Automation & AI | ||||
| AI Agents (Basic) | ||||
| AI Agents (Advanced) | ||||
| Playbooks | ||||
Integrations | ||||
| CRM Import | ||||
| CRM Integrations | ||||
| API Access | ||||
| Custom Integrations | ||||
| SSO / SAML | ||||
Support & Analytics | ||||
| Priority Support | ||||
| Analytics Dashboard | ||||
| Dedicated Success Manager | ||||
| Custom SLAs | ||||
Frequently Asked Questions
What does the email syntax validator check?
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The validator checks RFC 5322 email format compliance: proper use of @ symbol, valid local part characters, valid domain format, and TLD presence. It also checks for common typos in popular domains (gmail, outlook, yahoo) and flags role-based addresses like info@ or support@.
Is syntax validation the same as email verification?
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No. Syntax validation only checks if an email is formatted correctly, it doesn't check if the address actually exists or can receive mail. A syntactically valid email can still bounce. For full verification, use Cleanlist's email verification which checks mailbox existence, catch-all status, and deliverability.
Can I validate emails in bulk with this tool?
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This free tool validates one email at a time for quick checks. For bulk email validation, verifying hundreds or thousands of addresses, use Cleanlist's batch verification via CSV upload or API. Bulk verification also includes mailbox-level checks that go beyond syntax.
Run email syntax validator checks in bulk with Cleanlist
Verified data enrichment and email verification across 15+ providers. 30 free credits, no card required.
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