Email Syntax Validator
Email Syntax ValidatorCheck 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.
Syntax is step one. Verify deliverability free.
This confirms the address is correctly formed, instantly and free. Cleanlist then proves it is live, adding the SMTP mailbox handshake and catch-all detection through a multi-provider waterfall at 1 credit per verified email. Start the 14-day trial, no card.
- 25+providers in one waterfall lookup, priced as one result
- 98%verified work email on a 500-lead stratified test
- 85%direct dial on that same 500-lead test
- 0credits to search. Free and unlimited on every plan
You checked one address for format. Upload your list and run full deliverability checks on every row. 250 credits, 3 seats, 14 days. No card required.
How Does This Tool Work?
Before you send an email, make sure the address is formatted correctly. This free tool checks email syntax in real time as you type, catching formatting errors, invalid characters, missing components, and common typos like 'gmial.com' or 'outlok.com'. It's a quick first check, for full deliverability verification, use Cleanlist's email verification service.
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.
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
Get contact data where you already prospect
The Cleanlist Chrome extension pulls verified emails and direct-dial phone numbers off LinkedIn profiles and search results without leaving the tab. Every new workspace starts on Scale for 14 days (250 credits, 3 seats, no card), and the extension stays available afterwards on the $0 Free plan at 30 credits a month.
Which Cleanlist Plan Do You Need?
Annual billing takes 25% off every paid plan. Search is free and unlimited on all four: a verified work email is 1 credit however many providers it took, a direct dial 10, both together 11, validation 0.5, AI qualification 5. A miss costs nothing, and the credits sit in one shared team wallet.
Frequently Asked Questions
What does the email syntax validator check?
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?
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?
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.
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 VerifierGo beyond syntax: check deliverability with DNS, MX, and bulk CSV checks.
- MX LookupSee the mail servers and SPF setup behind any sending domain.
- Domain ValidatorConfirm a domain resolves and has valid MX records to receive mail.
- Email ExtractorEnter a website URL or paste text and pull out every email address on it, deduped.
Which Tool Should You Buy for This at Scale?
Independent comparisons of the platforms that do this job on a whole database, including where Cleanlist fits and where it does not.
Gain full access for 14 days.
250 credits, 3 seats, no card needed. Access to every feature except public API & MCP.
Cleanlist finds, verifies and enriches contact data, and syncs it two ways with HubSpot, Salesforce and Pipedrive, or one way out to Outreach, Salesloft and Lemlist. Cleanlist does not send email.