The simplest way to win the fight against email spam.

Tired of sending emails to inboxes that don't exist? So were we. That is why we built Lint Mail. A no-nonsense API to reduce bounce rates, increase conversions and boost your engagement, through email address verification.

Reduce bounce rates, increase conversions and boost your engagement with Lint Mail. A simple, no-nonsense, API for email address verification.

See for yourself

Type in an email address, watch us verify it instantly and show you exactly what's wrong (or right) with it.

Every email, any industry

We won't solve every problem. Instead, we focus on doing one thing exceptionally well: helping industries of all kinds identify invalid email addresses.

Web Services

Stop fake signups from cluttering your database. Keep the real customers, ditch the junk.

E-Commerce

Don't risk a sale for a bad email. Catch potential typos at checkout before they bounce back.

Financial Services

Verify that contact information meets your data quality standards for compliance and communication.

Events

Confirm attendees to ensure event updates and reminders are delivered successfully.

Publishing

Have confidence that your newsletter always gets sent to real subscribers, and engaged readers.

Real Estate

Keep your leads reachable when they're ready to buy or sell. Bad emails mean missed opportunities.

Get started in minutes

Lint Mail is designed to be effortless to use and easy to drop in. To verify a single email address, just prefix it with api.lintmail.dev.

Valid Case

REQUEST

curl -X GET "https://api.lintmail.dev/user@example.com"

curl -X GET "https://api.lintmail.dev/user@example.com"

RESPONSE

{
  "success": true,
  "data": {
    "email": "user@example.com",
    "result": "valid",
    "reason": {
      "type": "deliverable",
      "description": "Email address is valid and can receive mail"
    }
  },
  "error": null
}

{
  "success": true,
  "data": {
    "email": "user@example.com",
    "result": "valid",
    "reason": {
      "type": "deliverable",
      "description": "Email address is valid and can receive mail"
    }
  },
  "error": null
}

Warning Case

REQUEST

curl -X GET "https://api.lintmail.dev/admin@example.com"

curl -X GET "https://api.lintmail.dev/admin@example.com"

RESPONSE

{
  "success": true,
  "data": {
    "email": "admin@example.com",
    "result": "warning",
    "reason": {
      "type": "role",
      "description": "Role-based username detected"
    }
  },
  "error": null
}

{
  "success": true,
  "data": {
    "email": "admin@example.com",
    "result": "warning",
    "reason": {
      "type": "role",
      "description": "Role-based username detected"
    }
  },
  "error": null
}

Invalid Case

REQUEST

curl -X GET "https://api.lintmail.dev/weszwest@wh-7676.ml"

curl -X GET "https://api.lintmail.dev/weszwest@wh-7676.ml"

RESPONSE

{
  "success": true,
  "data": {
    "email": "weszwest@wh-7676.ml",
    "result": "invalid",
    "reason": {
      "type": "spam",
      "description": "Likely a spam or high-risk domain"
    }
  },
  "error": null
}

{
  "success": true,
  "data": {
    "email": "weszwest@wh-7676.ml",
    "result": "invalid",
    "reason": {
      "type": "spam",
      "description": "Likely a spam or high-risk domain"
    }
  },
  "error": null
}

How much does it cost?

Lint Mail is free, with sensible limits. But we're crafting the future based on your feedback. Join the waitlist to help shape what we build.

Free

$0 / month

For hobbyists and small projects in need of reliable verification without complexity.

Sponsor Us

What's Included

200 requests / month
Rate limits apply
Complete verification suite
Standard support (3-4 days)

Paid

Coming Soon

For growing products and their teams looking to scale with bulk verification and more.

Join Waitlist

Everything in Free, Plus

From 2,000 requests / month
No rate limits
Bulk verification
Custom configurations
Priority support (24-48 hours)
Early access to updates

The questions that everyone asks

Here you will find answers to the most frequently asked questions about Lint Mail. If you can't find what you're looking for, just reach out.

How accurate is Lint Mail's service?

Lint Mail aims for the highest accuracy in email validation. While no service can guarantee 100% due to catch-all domains and other factors, we get as close as possible while balancing speed and affordability.

Does Lint Mail store or share my data?

We do not store the email addresses you verify or share them with third parties. Email addresses are processed in real-time and immediately discarded after verification. We only retain anonymous usage statistics for service improvement.

Will Lint Mail improvement email deliverability?

Absolutely – using Lint Mail will improve your email deliverability. By removing undeliverable addresses, disposable accounts, spam addresses, and other suspicious contacts from your mailing lists, you'll drastically reduce your bounce rate and avoid the problems that come from sending to bad emails.

Maintaining a clean list improves your sender reputation, which means email providers see you as a trustworthy sender. This leads to more of your messages reaching your recipients' inboxes (instead of getting blocked or sent to spam).

What if I exceed the rate limit or need more support?

For users who exceed the rate limit limits, need more requests, or a custom solution, just get in touch and no doubt we can work something out. Do also join our waitlist and we'll notify you when our new plans are available.

What happens if I get a false positive or negative?

While our system aims to be as accurate as possible, incorrect results can occasionally occur due to server issues or other edge cases. If you encounter what you believe to be an incorrect result, please report it. All paid customers will receive a refund on their quota.