Free Bulk Email Validator

Validate up to 10 email addresses at once — check format, MX records, and disposable status instantly. No signup required.

Last updated: March 2026

Example results:

Email Format MX Valid Disposable Risk Score Status
user@gmail.com No 0 Accept
test@mailinator.com Yes 30 Review
nobody@nonexistent.xyz No 0 Accept

How It Works

1

Paste your list

Paste up to 10 email addresses into the text box above, one per line.

2

We validate each email

Fidro checks format, MX records, disposable status, and risk score for every email in your list.

3

Review results

See a results table with pass/fail indicators, risk scores, and clear recommendations for each email.

What We Check For Each Email

Every email in your list 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.

Risk Scoring

All checks feed into a weighted 0-100 risk score with a clear recommendation: accept, review, or block.

Why Validate Email Lists

Sending emails to invalid addresses is one of the fastest ways to damage your sender reputation. When your bounce rate exceeds 2-3%, email providers like Gmail and Outlook start routing your messages to spam — even for your legitimate subscribers.

Regular list validation directly protects your sender reputation. By removing invalid addresses, typo domains, and disposable emails before you send, you keep bounce rates low and deliverability high. This means more of your emails actually reach the inbox.

There's also a cost savings angle. Most email service providers charge based on list size or sends. Every invalid address on your list is money wasted — on storage, on sends that bounce, and on inflated subscriber counts that skew your engagement metrics.

Clean data leads to better decisions. When your email list is full of disposable and invalid addresses, your open rates, click rates, and conversion metrics are all artificially deflated. Removing bad addresses gives you an accurate picture of how your real audience engages with your content.

Email List Hygiene Best Practices

  • Validate at collection. Check email addresses in real time at the point of signup. Catching bad addresses before they enter your database is far more effective than cleaning up later.
  • Re-validate periodically. Email addresses go stale. People change jobs, abandon inboxes, and domains expire. Run your list through validation at least quarterly to catch addresses that have become invalid.
  • Segment by engagement. Separate your active subscribers from inactive ones. Subscribers who haven't opened an email in 90 days should be moved to a re-engagement campaign or removed entirely.
  • Remove hard bounces immediately. A hard bounce means the address is permanently undeliverable. Continuing to send to these addresses actively damages your sender reputation with ISPs.
  • Use double opt-in. Requiring email confirmation ensures the address is real and the owner actually wants to hear from you. This single step eliminates most fake signups and typo addresses.

Frequently Asked Questions

How many emails can I validate at once?

You can validate up to 10 email addresses at once using this free bulk validator. Simply paste one email per line into the text box and click Validate All. For larger lists, Fidro's API supports batch validation of thousands of emails.

What does bulk email validation check?

Each email is checked for RFC-compliant format, MX record existence (can the domain receive mail), disposable email provider detection, and an overall risk score. The results include a clear recommendation: accept, review, or block.

How accurate is email validation?

Fidro's email validation is highly accurate. Format checks follow RFC 5322 standards, MX record lookups query DNS in real time, and our disposable email database covers over 200,000 known temporary email providers and is updated daily.

Why should I clean my email list?

Dirty email lists lead to high bounce rates, damaged sender reputation, wasted marketing spend, and poor deliverability. Regularly validating your list removes invalid addresses, disposable emails, and risky contacts — keeping your campaigns effective and your domain reputation intact.

What happens to invalid emails?

Invalid emails are flagged with a high risk score and a "Block" recommendation. The results table shows exactly what failed — whether it's a bad format, missing MX records, or a disposable provider — so you can decide how to handle each address.

Is this bulk validator free?

Yes, this bulk email validator is completely free with no signup required. You can validate up to 10 emails at a time. For higher-volume needs, Fidro offers a free API plan with 200 validations per month — no credit card required.

Need to validate thousands of emails?

Add bulk email validation to your workflow with one API call. Validate entire lists programmatically with email, IP, geolocation, and risk scoring in a single request. 

curl -X POST https://fidro.io/api/validate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{"email": "user@example.com"}'
Start free — 200 validations/month Read the docs

Also try our email checker, IP checker, VPN detector, domain checker, and disposable emails database.