Clean your email lists. Protect your reputation.

MailRook Email Validation verifies email addresses in real time so you can reduce bounces, improve deliverability, and stop wasting money on bad contacts.

Get started free 100 free checks/day — no credit card
GDPR Compliant
99.9% Uptime
Under 500ms
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What we check
Valid format
Domain
Deliverable
No catch-all
Generic
Not Disposable
Company Email
Not University
Use Cases

Built for teams that care about deliverability

Whether you're sending campaigns, collecting signups, or cleaning your CRM, MailRook Email Validation keeps your data pristine.

Email marketing

Clean your subscriber lists before sending campaigns. Lower bounce rates mean better inbox placement and higher open rates across Mailchimp, SendGrid, and others.

Signup forms

Validate emails at the point of entry. Block typos and disposable addresses instantly.

SaaS & apps

Integrate the API into your registration flow. Prevent fake accounts and keep your user base real.

CRM

CRM hygiene

Periodically clean your CRM or sales pipeline. Remove stale contacts, fix data quality issues, and make sure your sales team reaches real prospects.

Features

Everything you need to validate emails

Fast, accurate, and developer-friendly. MailRook Email Validation handles the hard parts so you can focus on growing your business.

Real-time verification

Validate any email address in under 500ms. Check syntax, domain, MX records, and mailbox existence instantly.

Bulk list cleaning

Upload your entire contact list and get it cleaned in minutes. CSV export included with detailed status for every address.

Simple REST API

Integrate email validation into your app, signup forms, or CRM with a single API call. Well-documented and easy to use.

GDPR compliant

Your data stays safe. We never store email addresses after validation, and all connections are encrypted end to end.

Catch-all detection

Identify catch-all domains that accept any address, so you can make informed decisions about risky contacts.

Inbox protection detection

Detect Proofpoint, Mimecast, and 8 other enterprise email gateways. Know which prospects are behind enterprise inbox protection before you send.

How it works

Three steps to cleaner email lists

1

Enter or upload emails

Paste a single address, use the API, or upload a CSV file with thousands of contacts.

2

We verify each address

MailRook Email Validation checks syntax, DNS, MX records, and connects to the mail server to confirm deliverability.

3

Get clean results

Download your verified list or receive results via API. Every address is marked as valid, invalid, or risky.

Pricing

Simple, transparent pricing

Start free — no credit card required. Upgrade when you need more volume.

Free forever
$0 / month

Perfect for developers and small teams getting started with email validation.

  • 100 free checks per day
  • Single & bulk email validation
  • REST API access
  • Syntax, DNS, MX & mailbox checks
  • Catch-all & disposable detection
  • No credit card required
Get started free
Popular
One-time purchase
$39

10,000 credits — use at your own pace. No subscription, no expiration.

  • 10,000 verification credits
  • Credits never expire
  • Everything in the free plan
  • One-time payment — no recurring fees
  • $0.0039 per verification
Buy credits
High volume
Custom

For businesses and teams that need high-volume validation or dedicated infrastructure.

  • Unlimited or high-volume checks
  • Everything in the free plan
  • Priority support
  • SLA & dedicated infrastructure
  • Custom integrations & onboarding
Contact us
FAQ

Frequently asked questions

MailRook Email Validation performs multiple checks: syntax validation, DNS and MX record lookup, mailbox deliverability verification, catch-all detection, disposable email detection, and free email provider identification. Each check returns a separate flag so you can decide how strict your filtering should be.
Single email validations typically complete in under 500 milliseconds. Bulk list processing depends on list size, but most lists of up to 10,000 addresses finish within a few minutes.
No. MailRook Email Validation does not permanently store the email addresses you validate. Addresses are processed in memory and discarded after the validation result is returned. We are fully GDPR compliant.
A catch-all (or accept-all) domain is configured to accept emails sent to any address at that domain, even if the specific mailbox does not exist. This makes it impossible to confirm whether a particular address is real. MailRook Email Validation flags these so you can handle them separately.
Yes. Use the REST API to validate emails in real time as users sign up. A single GET request returns the full validation result, making it straightforward to block invalid or disposable addresses at the point of entry.
Yes. Every account gets 100 free email checks per day — no credit card required. This lets you validate emails, test the API, and explore all features before committing to a paid plan.
Yes. MailRook Email Validation detects 10 enterprise email security gateways including Proofpoint, Mimecast, Barracuda, Cisco, and FortiMail via MX record analysis. Every validation returns an email_security array listing detected gateways and a protection_level field (none, basic, or enterprise) — helping cold outreach teams prioritize unprotected inboxes for higher reply rates.

Start validating emails today

100 free email checks every day — no credit card needed. Upgrade when you need more volume.

Get started free