Free Email Validation Tool
Check if an email address is valid, disposable, or risky — instantly. No signup required.
Free demo limited to 1 request per 30 seconds per IP. Sign up for 200 validations/month on the free plan.
How It Works
Enter an email
Type or paste any email address into the validator above.
We run the checks
Fidro validates format, checks MX records, and scans our disposable email database.
Get your results
See a risk score, detailed check results, and a clear recommendation: accept, review, or block.
What We Check
Every email is run through multiple validation layers to give you a complete risk picture.
Format Validation
RFC-compliant syntax check to catch typos, missing domains, and malformed addresses.
MX Record Verification
DNS lookup to confirm the domain has a mail server that can actually receive email.
Disposable Detection
Cross-referenced against thousands of known temporary and disposable email providers.
Domain Reputation
Checks the domain against known-bad registrars, recently created domains, and abuse databases.
Blocklist Check
Matches against your custom blocklists — block specific emails, domains, or patterns.
Risk Scoring
All checks feed into a weighted 0-100 risk score with a clear recommendation: accept, review, or block.
Frequently Asked Questions
What is a disposable email?
A disposable email is a temporary address from services like Mailinator, Guerrilla Mail, or 10MinuteMail. They let users create throwaway inboxes without providing real contact information. Businesses should block these because they're commonly used to abuse free tiers, create spam accounts, and bypass verification flows.
How does email validation work?
Email validation works in layers. First, the address is checked for correct syntax (RFC compliance). Then a DNS lookup verifies the domain has MX records — meaning it can actually receive mail. Finally, the domain is checked against databases of known disposable providers, blocklists, and reputation data. The results are combined into a single risk score.
Why should I validate email addresses?
Invalid and fake emails pollute your user base, skew analytics, increase bounce rates on marketing emails, and create support overhead. Disposable emails specifically are used to exploit free trials, create duplicate accounts, and bypass security measures. Validating at signup keeps your data clean and your product metrics accurate.
Is this tool free?
Yes, this tool is completely free with no signup required. For higher-volume needs, Fidro offers a free API plan with 200 validations per month — no credit card required. Paid plans start at $29/month for 5,000 validations.
Need to validate emails at scale?
Add email validation to your signup flow with one API call. Get email, IP, geolocation, and Stripe chargeback checks in a single request.
curl -X POST https://fidro.io/api/validate \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{"email": "user@example.com"}'See how Fidro compares to other email validation tools.