99.9% Uptime

Email Verification API
at $0.001/email

6x cheaper than ZeroBounce. 8x cheaper than NeverBounce. Same accuracy. Credits that never expire. Verify by API, MCP, CSV upload, or single verification. Built for developers who ship fast.

Verifying a list instead? Create a free account to upload a CSV →

Get 100 Free Credits View API Docs

No credit card required · Credits never expire · API, MCP & CSV supported

At 100K emails: MailValid saves you $290 vs ZeroBounce ($100 vs $390). Same 95%+ accuracy. Credits never expire.

Trusted by teams at

"MailValid cut our email bounce rate by 90%. We switched from ZeroBounce and saved over $300 a month. The API is dead simple to integrate and the accuracy is spot on."

Nikhil

10ex.ai

How it works

Three-step verification process ensures maximum accuracy

Syntax Validation

RFC 5322 compliant email format validation. Catches typos and formatting errors instantly.

Domain & MX Check

Verifies domain exists and has valid mail exchange records configured.

Mailbox Verification

SMTP-level verification confirms the mailbox exists without sending an email.

Simple API integration

One API endpoint. JSON in, JSON out. Integrate in minutes with any language or framework.

Single & bulk verification endpoints
Detailed response with 10+ data points
Average response time under 2 seconds

cURL

# Verify a single email
curl -X POST https://mailvalid.io/api/v1/verify/single \
  -H "X-API-Key: mv_live_your_key" \
  -H "Content-Type: application/json" \
  -d '{"email": "test@example.com"}'

# Response
{
  "success": true,
  "result": {
    "email": "test@example.com",
    "status": "valid",
    "is_valid": true,
    "is_disposable": false
  }
}

Four ways to verify — pick what fits your workflow

One engine, one price — $0.001/email, however you connect.

Single verification Web App

Paste one address, get an instant result. No account needed to try.

Try it free

Bulk CSV upload Web App

Drop a spreadsheet, download clean results. Free account required, no code.

REST API Developers

POST a request, get JSON back in under 500ms. Docs in 6 languages.

View API docs

MCP Server AI agents

Connect Claude, Cursor, or any MCP client — your agent verifies emails directly.

MCP setup guide

AI agents · MCP

MCP integration

Connect Claude, Cursor, or any MCP-compatible client. Same verification engine, same credit system, zero extra setup.

Works with Claude Desktop, Claude Code, Cursor, and any MCP client
Same $0.001/email pricing and credit balance as the REST API
Two tools work with no API key, so agents can try it before you connect an account

View full MCP docs

{
  "mcpServers": {
    "mailvalid": {
      "command": "npx",
      "args": ["-y", "@mailvalid/mcp"],
      "env": { "MAILVALID_API_KEY": "mv_live_your_key_here" }
    }
  }
}

claude mcp add --transport http mailvalid https://mailvalid.io/mcp/ \
  --header "X-API-Key: mv_live_your_key_here"

{
  "mcpServers": {
    "mailvalid": {
      "url": "https://mailvalid.io/mcp/",
      "headers": { "X-API-Key": "mv_live_your_key_here" }
    }
  }
}

Comprehensive detection

Every verification includes multiple data points

Disposable Emails

Detect temporary email services

Role-Based

Identify info@, support@, etc.

Free Providers

Gmail, Yahoo, Outlook detection

Catch-All

Domains that accept all emails

Built for every use case

From signup forms to bulk list cleaning, verify emails wherever you need them

SaaS Signup Verification

Verify emails at registration to prevent fake accounts, reduce spam signups, and improve user quality from day one.

Email List Cleaning

Clean your marketing lists before campaigns. Remove invalid, disposable, and risky emails to protect sender reputation.

E-commerce Checkout

Validate customer emails during checkout to ensure order confirmations and shipping updates reach them.

CRM Data Hygiene

Keep your CRM clean with regular verification. Identify stale contacts and maintain high-quality lead data.

Lead Generation

Verify leads in real-time as they come in. Filter out fake submissions and focus on real prospects.

No code · Web app

Clean an entire list — no code required

Upload a CSV or TXT file right in your dashboard and MailValid verifies up to 10,000 addresses per job, automatically detecting the email column. When it's done, download clean results as CSV or JSON — no API key, no code.

1

Upload your file

Drop a CSV or TXT — we auto-detect the email column, no formatting required.
2

We verify in the background

Every address is checked for validity plus disposable, role-based, and catch-all flags.
3

Download clean results

Export the verified list as CSV or JSON, ready to import anywhere.

Create a free account to upload Or use the bulk API

Drop your CSV here

CSV or TXT · up to 10,000 emails

contacts.csv

8,432 emails

Verified

[email protected] Valid

[email protected] Invalid

[email protected] Disposable

Why developers choose Mailvalid

Built by developers, for developers who need reliable email verification

Sub-second response times

Average API response under 500ms. Perfect for real-time form validation without slowing down your UX.

Credits never expire

Any credits you buy never expire — use them whenever you want. Choose a monthly plan for steady volume, or top up pay-as-you-go anytime.

Developer-first API

Clean JSON responses, comprehensive docs, and code examples in every major language. Integrate in minutes.

95%+ accuracy rate

Multi-layer verification including syntax, DNS, MX records, and SMTP mailbox checks for maximum accuracy.

Bulk verification, your way

Verify thousands of emails via CSV upload, our bulk API endpoint, or MCP tool calls. Perfect for list cleaning, migrations, and agent workflows.

99.9% uptime SLA

Enterprise-grade infrastructure with redundancy across multiple regions. Your verification never stops.

95%+

Accuracy Rate

<500ms

Avg Response Time

99.9%

Uptime SLA

10M+

Emails Verified

Frequently asked questions

Everything you need to know about email verification

Do credits expire, or will I lose them if I cancel my plan?

No — credits never expire, whether you're on Free, a paid plan, or a pay-as-you-go top-up. If you cancel a monthly plan, any credits already in your balance stay yours to use. You just stop accumulating new monthly credits and lose access to that plan's higher rate limits.

What's the difference between Mailvalid and ZeroBounce/NeverBounce?

Mailvalid focuses on being developer-friendly with simple pricing and a clean API. Unlike ZeroBounce, we don't charge extra for data enrichment features you may not need. Unlike NeverBounce (which offers only 10 free credits), we give you 100 free credits to test properly. Our credits never expire, and we offer transparent, pay-as-you-go pricing without monthly minimums.

Can I verify emails without writing any code?

Yes. Use the web app to check a single address instantly — no signup needed. For bulk lists, create a free account and upload a CSV — no API key or code required. Developers can also use the REST API or MCP server for automated workflows.

Do you support AI agents and MCP?

Yes. MailValid runs a hosted MCP server (Streamable HTTP) that works with Claude, Cursor, and any MCP-compatible client, so your AI agent can verify emails directly — same accuracy and pricing as the API. See the MCP setup guide →

How does email verification work?

Our verification process uses a multi-step approach: First, we validate the email syntax against RFC 5322 standards. Then, we check if the domain exists and has valid MX (mail exchange) records. Finally, we perform an SMTP handshake with the mail server to confirm the mailbox exists—all without sending an actual email.

What counts as one verification credit?

One credit is used for each fresh completed verification: valid, invalid, catch-all, or do-not-mail. Duplicate emails in the same bulk upload, recently verified repeats, and inconclusive checks are free.

See all FAQs

Works with your stack

RESTful API with examples in every major language

Python

Node.js

Ruby

PHP

Java

MCP Claude, Cursor & more

View API Documentation

Latest from the MailValid blog

Pricing comparisons, deliverability deep-dives, and integration guides for developers

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Email Verification API at $0.001/email