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100 free credits on signup · No credit card

Email validation, simple.

Stop bounces, protect your sender reputation, and reach real inboxes. Built for marketers, developers, and anyone who sends email at scale.

We do not store or reuse the emails you test.

From $0.0012 per check  ·  Pay-as-you-go credits

How it works

A simple 3-step process

Upload, validate, download. We remove duplicates, invalid emails, bounces, and spam traps so you can send with confidence.

  1. 01

    Upload

    Drop a CSV or TXT file with your email list. Up to 1M rows per upload.

  2. 02

    Validate

    Our multi-layer engine identifies bounces, traps, and disposable emails with high accuracy.

  3. 03

    Download

    Export your clean list as CSV. Filter by deliverable, risky, or unknown.

Products

Two ways to validate.

Use the dashboard for bulk lists or wire our API into your stack for real-time checks.

Email List Validation

Upload a CSV/TXT and clean millions of emails. Download deliverable contacts ready to import into your ESP.

Learn more

Email Validation API

Verify emails in real time at signup, checkout, or anywhere in your funnel. One HTTP call.

See docs

Features

Powerful, by default.

Every validation runs through the same multi-layer engine that powers our API.

Minimize bouncing

Detect invalid and hard-bouncing addresses before they hit your ESP.

Catch-all detector

Flag domains that accept everything so you can decide what to send.

Anti-greylisting

Bypass greylisting servers to reduce the unknown rate.

Disposable check

Identify temporary inboxes (mailinator, guerrillamail, and 200+ more).

Email deduplication

Automatic dedupe keeps your credit usage lean.

Syntax & MX checks

Catch typos and dead domains before validation even starts.

For developers

A single endpoint.
Any language.

Drop our REST API into your signup, checkout, or CRM flow. Returns a clear deliverability status plus signals (role, free provider, disposable, accept-all) you can act on.

Read the API docs Get an API key 
# Verify a single email
curl https://debounceapi.com/api/v1/verify \
  -H "Authorization: Bearer dbk_live_…" \
  -H "Content-Type: application/json" \
  -d '{"email":"[email protected]"}'

# →
{
  "email": "[email protected]",
  "status": "deliverable",
  "score": 92,
  "free_email": true,
  "role": false,
  "disposable": false
}

FAQ

Frequently asked.

Everything you need to know about email validation and how DebounceAPI works.

What is email verification?
Email verification (or validation) confirms whether an address is real, active, and able to receive mail. It catches typos, dead inboxes, disposable addresses, and spam traps before you send.
Why does it matter for email marketing?
Mailbox providers like Gmail and Outlook punish senders with high bounce rates. Cleaning your list keeps your sender reputation high and your inbox placement strong.
What is the difference between validation and verification?
They are used interchangeably. Both refer to checking whether an email can receive mail without bouncing.
How often should I clean my list?
Aim for every 3–6 months, or before each major campaign. 20–30% of an email list goes stale every year.
How accurate is DebounceAPI?
We combine syntax checks, MX/DNS lookups, disposable detection, role detection, catch-all heuristics, and SMTP verification for 99%+ accuracy on most domains.

Get started today.

Sign up and get 100 free credits to test list cleaning and the API. No card required.

Get started free See pricing