MailboxValidator
Connects Claude to the MailboxValidator API for email verification workflows. Exposes three tools: validate_email runs comprehensive checks including syntax, DNS/MX records, greylisting, disposable providers, and suppression lists. check_disposable_email and check_free_email handle those specific lookups. Requires a MailboxValidator API key (free tier gives 300 queries monthly). Reach for this when you need to validate user signups, clean email lists, or filter out temporary addresses in your prompts. Runs via npx with stdio transport, so setup is just adding credentials to your Claude config and restarting.
- tools
- 3
- auth
- Secret needed
- transport
- STDIO
- env var
- 1
- last updated
- May 28, 2026
Tools
3 toolsPublic tool metadata for what this MCP can expose to an agent.
validate_emailValidates the email address given. It helps users to determine if an email address is potentially reachable by checking the syntax, DNS, MX server, disposable list and more.
Validates the email address given. It helps users to determine if an email address is potentially reachable by checking the syntax, DNS, MX server, disposable list and more.
No parameter schema in public metadata yet.
check_disposable_emailChecks if the email address given is from a disposable email provider.
Checks if the email address given is from a disposable email provider.
No parameter schema in public metadata yet.
check_free_emailChecks if the email address given is from a free email provider.
Checks if the email address given is from a free email provider.
No parameter schema in public metadata yet.
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MAILBOXVALIDATOR_API_KEY*secretYour MailboxValidator API key.
Readme
MailboxValidator MCP server
This is a simple Model Context Protocol (MCP) server implementation for MailboxValidator API. It will return validation result for an email address.
Features
- Comprehensive Email Validation: Checking an email address to see if an email is reachable by checking the syntax, DNS, MX server, high risk, suppressed list, and more.
- Disposable Email: Checking an email address to see if it's from a temporary/disposable email provider.
- Free Email: Checking an email address to see if it's from a free email provider.
Requirement
This MCP server requires an API key. You can also sign up for a free API key and enjoy up to 300 queries per month.
The local MCP server setup also uses Node.js and npm, which can be downloaded at Node.js website.
Setup
There are two ways to use this MCP server:
Details
- Repository
- github.com/mailboxvalidator/mcp-mailboxvalidator
- Category
- Communication & Messaging
- Package
mcp-mailboxvalidator- Transport
- STDIO
- Auth
- Required
- Registry
- MCP registry, active
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