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MailValid

Week 28, 2026

Affordable email verifier: 99% accurate results in under 500 ms

#12Be the first to reviewEmail, SaaS, Email Marketing
MailValid - Affordable email verifier: 99% accurate results in under 500 ms
MailValid - Affordable email verifier: 99% accurate results in under 500 ms

About MailValid

MailValid is an affordable email verifier and email verification service for small teams, agencies, recruiters and developers. Verify one email free, clean a whole list with no code, or connect the REST API or MCP server and get each result back in under 500 ms, with 99% accuracy. Every address goes through a multi-step check: syntax (RFC 5322), domain and MX records, and an SMTP-level mailbox check that never sends an email. MailValid also flags disposable, role-based, free-provider and catch-all addresses, so you know exactly what is safe to send. Four ways to verify, one price: • Single check in the browser, free, no account needed • Bulk CSV or TXT upload, up to 10,000 emails per job, with the email column detected automatically • REST API with webhooks for signup forms, CRMs and lead pipelines • MCP server for AI agents in Claude, Cursor and other MCP clients, listed on the official MCP Registry Pricing that stays fair as you grow: 100 free credits on signup with no card, pay-as-you-go packs from $8 for 2,000 emails, or MailValid Plus from $29/month. You only pay for definitive results: unknown results are free, and credits never expire. Enterprise plans for 250,000+ emails a month add volume pricing, custom rate limits and an SLA. Built for sales and outreach teams cleaning Apollo or Clay exports, email marketing and lead-gen agencies verifying client lists, recruiters checking candidate emails, SaaS teams blocking fake signups, and developers building AI agents that send email. More than 24.2 million emails verified so far.

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Overview

Who is it for?

Small sales and outreach teams, email marketing and lead-gen agencies, recruiters, SaaS teams, developers and AI agent builders

Problem

Bad email addresses cost real money. Bounces damage your sender reputation and push campaigns into spam, fake signups clog your product and CRM, and contact lists go stale every month. Most verifiers answer this with big monthly plans, credits that expire and a slow setup that small teams can't justify.

Solution

MailValid checks each address in under 500 ms with syntax, DNS/MX and SMTP mailbox checks, then flags disposable, role-based, free-provider and catch-all emails. Clean a CSV in the browser, verify at signup through the REST API, or let an AI agent verify through the MCP server, with a webhook when a bulk job finishes.

What makes it unique

Affordable without cutting corners: 99% accuracy, results in under 500 ms, pay-as-you-go from $8, unknown results never billed, and credits that never expire. One engine powers the web app, CSV upload, REST API and MCP server, so every team gets the same result at the same price. AI agents can even register for their own API key and hand the account to a human later.

FAQ

What is MailValid?
MailValid is an affordable email verifier and email verification service. It checks whether an email address is real and safe to send to, with 99% accuracy and results in under 500 ms, through a web app, bulk CSV upload, REST API or an MCP server for AI agents.
Who is MailValid for?
Small sales and outreach teams cleaning Apollo or Clay exports, email marketing and lead-gen agencies verifying client lists, recruiters checking candidate emails, SaaS teams blocking fake signups, and developers and AI agent builders. Enterprise plans cover teams verifying 250,000+ emails a month.
How does email verification work?
Each address goes through a multi-step check: syntax validation (RFC 5322), domain and MX record lookup, and an SMTP-level mailbox check that confirms the inbox exists without sending an email. MailValid also flags disposable, role-based, free-provider and catch-all addresses.
How much does MailValid cost?
Start with 100 free credits, no credit card required. Pay-as-you-go packs are one-time purchases from $8 for 2,000 emails and $19 for 5,000. MailValid Plus is a monthly plan from $29 for 10,000 emails up to $799 for 1,000,000 ($0.80 per 1,000). Enterprise pricing is custom for 250,000+ emails a month.
What counts as one verification credit?
One credit is used per definitive result: valid, invalid, catch-all or do-not-mail. Unknown results, malformed addresses and duplicates within a batch are free, so you only pay for answers you can act on.
Do credits expire?
No. Free, pay-as-you-go, MailValid Plus and top-up credits never expire and roll over indefinitely.
How fast and accurate is MailValid?
Single verifications return in under 500 ms on average, with 99% accuracy. Bulk jobs run in the background, and a webhook tells you when results are ready to download as CSV or JSON.
Can I verify a whole email list in bulk?
Yes. Upload a CSV or TXT file in the dashboard and MailValid verifies up to 10,000 addresses per job on paid plans (100 on the free plan), detecting the email column automatically. You can also submit bulk jobs through the API.
Can AI agents use MailValid?
Yes. MailValid runs a hosted MCP server at https://mailvalid.io/mcp/ that works with Claude, Cursor and other MCP clients, and is listed on the official MCP Registry as io.mailvalid/email-verifier. Agents can register for their own API key and hand the account to a human later.
How is MailValid different from ZeroBounce or NeverBounce?
MailValid is built to be affordable for small teams: pay-as-you-go from $8 with no monthly minimum, unknown results never billed, credits that never expire, and the same 200 requests per minute on every paid plan. It also offers an MCP server so AI agents can verify emails directly.

Weekly rankings

#12
2026-W28

25 products

9