MailboxValidator Email Validation MCP Server
OfficialServer Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| MAILBOXVALIDATOR_API_KEY | Yes | The API key for MailboxValidator. A free key allows up to 300 queries per month; paid plans are available for more. |
Instructions
Guidance the server publishes about itself, which clients place ahead of the tool catalog so the model reads it before choosing anything.
This server publishes no instructions, or was last inspected before Glama recorded them.
Capabilities
Features and capabilities supported by this server
Protocol revision2025-11-25
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| validate_emailA | Checks if an email address is valid and reachable using MailboxValidator. |
| check_disposable_emailB | Checks if an email address is a disposable email using MailboxValidator. |
| check_free_emailB | Checks if an email address is a free email using MailboxValidator. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
TDQS
Scored across 3 tools
Each tool targets a distinct aspect of email validation: disposable, free, and general validity/reachability. There is no overlap in their purposes.
All tool names follow a consistent verb_noun pattern (check_disposable_email, check_free_email, validate_email) with snake_case, making them predictable.
Three tools is a reasonable and focused set for an email validation server, covering key functions without unnecessary bloat.
The set covers primary email validation needs (disposable, free, general validity). Minor gaps like syntax-only checks are absent, but the core surface is solid.