99.9% Uptime · 10M+ Emails Verified

Email Verifier That Costs $0.0008/Email

Upload your CSV, spot invalid addresses, and download your verified results. No code needed.

$129 per 100,000 emails on MailValid Plus, versus $390 at ZeroBounce and $800 at NeverBounce on their published rates.

Start cleaning free

100 free credits · No credit card required · API, MCP & CSV supported

Teams that trust MailValid

10M+ emails verified at 95%+ accuracy — used by SaaS, agencies, recruiters, and outbound teams worldwide.

At 100K emails: MailValid costs $129 vs $390 at ZeroBounce - same 95%+ accuracy, and your credits never expire.

Four ways to verify emails

One engine, one price - from $0.0008/email, however you work.

Single verification Web App

Paste one address, get an instant result. Free, no account needed.

Try it free

Bulk CSV upload Web App

Drop a spreadsheet, download clean results. No code, no API key.

REST API Automation

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

What our customers say

"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

"I use MailValid as a pre-send verification step in a cold email pipeline (single-email API calls, low volume). The API is simple to integrate, and it reliably catches invalid, disposable, and syntax/MX failures. The status_reason field (e.g., role-based) is genuinely useful — I allow role addresses by policy, and the granularity makes it a one-line decision rather than guesswork."

Oded Vilner

W2M LIMITED

"Lightning-fast email verification in under 500ms. Email verification takes less than 500ms. We use it to verify candidate lists and clean our ATS before outreach. Removing invalid emails meant more of our outreach actually reached people."

ASH M.

"MailValid delivers fast responses and flexible, non-expiring credits. MailValid has a really quick response time. Even after I cancelled my subscription, the email verification credits did not expire. MailValid is very affordable. The email verification results are value for money and accurate."

Awan Y.

"An intuitive, cost-effective tool with fantastic, responsive support. The tool is very intuitive, and the support team is fantastic — helpful and very responsive. I highly recommend this tool, as it’s also very cost-effective."

Mark I.

Built for every team that sends email

From cleaning email lists to verifying signups, MailValid fits how you work

Email List Cleaning

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

Learn more

Lead & Contact List Verification

Bought or scraped a contact list? Verify it before your first send to protect your sender reputation from day one.

Learn more

Cold Email & Outreach

Verify every prospect list before it hits the sequencer, so campaigns start clean and replies reflect your message - not your bounce rate.

Learn more

Recruiting Outreach

Verify candidate lists before outreach. Reach real inboxes, protect your agency's sending domain.

Learn more

CRM Data Hygiene

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

Learn more

SaaS Signup Verification

Verify emails at registration to block disposable addresses and fake accounts from day one.

Learn more

See all use cases →

Email list cleaning

Upload a CSV or TXT file in your dashboard and MailValid verifies up to 10,000 addresses per job, automatically detecting the email column. Download clean results as CSV or JSON - no API key, no code, no formatting required.

1

Upload your file

Drop a CSV or TXT - we auto-detect the email column.
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

jane@company.com Valid

info@spam.tk Invalid

temp@mailinator.com Disposable

How email verification works

Every address goes through a three-step check for maximum accuracy

Syntax Validation

Instantly catches typos, formatting errors, and fake patterns before they reach your list.

Domain & MX Check

Confirms the domain exists and is actually set up to receive email.

Mailbox Verification

SMTP-level check confirms the individual mailbox exists - without ever sending an email.

Try a free verification Get 100 Free Credits

Comprehensive email 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

Get 100 Free Credits View API docs

Why Teams Choose MailValid as Their Email Verification Service

Accurate, affordable email verification - with or without code

No code needed

Verify a single email or clean an entire list right in your browser. No API key, no setup.

Credits never expire

Buy credits once, use them whenever. Monthly plans for steady volume, pay-as-you-go for everything else.

95%+ accuracy rate

Multi-layer verification: syntax, DNS, MX records, and SMTP mailbox checks.

Bulk verification, your way

CSV upload, bulk API, or MCP tool calls - clean thousands of emails however you prefer.

Works with every workflow

Start in the web app, upload a CSV, or automate with clear docs and examples in every major language.

99.9% uptime SLA

Enterprise-grade infrastructure with multi-region redundancy.

95%+

Accuracy Rate

<500ms

Avg Response Time

99.9%

Uptime SLA

10M+

Emails Verified

Simple Email Verification 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
  }
}

AI agents · MCP

Email Verification 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 pay-as-you-go 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" }
    }
  }
}

Frequently asked questions

Everything you need to know about email verification

What is an email verification service?

An email verification service checks whether an email address is real and able to receive mail, without sending a message to it. MailValid's email verification service checks each address's syntax, domain and MX records, and whether the mailbox exists. It also flags disposable, role-based and catch-all addresses. This email validation service cuts bounces, protects your sender reputation and keeps your list clean.

Is MailValid free to use?

Yes - check a single email for free with no account, and get 100 free credits when you sign up. No credit card required.

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. Teams can also automate verification through the REST API or MCP server.

Is MailValid good for agencies managing multiple client lists?

Yes - verify unlimited client lists with credits that never expire and no per-client account limits.

Can I verify a purchased or scraped contact list before emailing it?

Yes - upload it as a CSV and MailValid flags invalid, disposable, and risky addresses before you send.

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 straightforward email verification with no-code tools, simple pricing, and API or MCP access when you need automation. 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 pricing is transparent: MailValid Plus from $29/month, or one-time pay-as-you-go credit packs from $19 — no subscription required.

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 and inconclusive checks are free.

Are all email verifications charged?

No. MailValid only deducts a credit when a verification returns a final, actionable result: valid, invalid, catch_all, or do_not_mail. If a verification returns unknown, no credit is deducted. Unknown results are automatically skipped in both single and bulk verification, so you only pay for verifications that produce a usable result.

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

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Verify Every Email Before It Costs You.

Start with 100 free credits. No credit card, no code required. Set up in under 5 minutes.

Get 100 Free Credits View Pricing