MailValid

Real-time email verification API with SMTP, MX, disposable, role-based, and catch-all detection. Verify single or bulk emails with confidence scoring.

About MailValid

MailValid is an email verification and list-cleaning service. It checks email addresses through syntax validation, domain and MX record checks, and SMTP-level mailbox verification, and flags disposable addresses, role-based addresses (such as info@ or support@), free email providers, and catch-all domains. Results are delivered through single-address checks in a web app, CSV/TXT bulk upload (up to 10,000 addresses per job, with automatic column detection), a REST API, and an MCP server for AI agents such as Claude Desktop, Claude Code, and Cursor.

The service is aimed at teams that send email in volume and need to protect sender reputation and deliverability, including SaaS companies verifying signups, agencies and recruiters checking candidate or client lists, cold email and outreach teams verifying prospect lists before sequencing, and users maintaining CRM data hygiene. It supports both individuals cleaning purchased or scraped contact lists and teams automating verification as part of a signup or outreach pipeline.

Pricing is $0.00075 per email ($75 per 100,000 emails), with credits that do not expire; new accounts receive 100 free credits and can check a single email for free without an account. The API returns JSON responses, including a status_reason field and other data points, with an average response time under 500ms and a 99.9% uptime SLA. API documentation is available in six languages, and the MCP server offers two tools usable without an API key before connecting an account.

Key features

Verifies emails via syntax, domain/MX, and SMTP-level mailbox checks without sending an email
Detects disposable, role-based, free-provider, and catch-all addresses
Bulk CSV/TXT upload verifies up to 10,000 emails per job with auto-detected email column
REST API with single and bulk verification endpoints, under 500ms average response time
MCP server integration for Claude, Cursor, and other MCP clients
99.9% uptime SLA with multi-region redundancy

Frequently asked questions

Is MailValid free to use?

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

Can I verify emails without writing any code?

Yes, the web app checks a single address instantly with no signup, and bulk lists can be verified by uploading a CSV without an API key.

Do credits expire?

No, credits never expire, and they can be used whenever regardless of plan cancellation.

What integrations does MailValid support?

It offers a REST API with docs in six languages and an MCP server that works with Claude Desktop, Claude Code, and Cursor.

How much does MailValid cost?

MailValid costs $0.00075 per email, or $75 per 100,000 emails, compared to $390 at ZeroBounce and $800 at NeverBounce.

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