SimpleVerifier
Verify email addresses with a live SMTP mailbox check, check phone number formats and email domains.
Install
Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).
claude mcp add --transport http simpleverifier 'https://simpleverifier.com/api/mcp' --header 'Authorization: <Optional. Bearer followed by your SimpleVerifier API key (sv_live_...) from https://simpleverifier.com/api-keys. Leave empty to sign in with OAuth instead. API and MCP access come with the Pro, Business and Agency plans: https://simpleverifier.com/pricing>'{
"mcpServers": {
"simpleverifier": {
"type": "http",
"url": "https://simpleverifier.com/api/mcp",
"headers": {
"Authorization": "<Optional. Bearer followed by your SimpleVerifier API key (sv_live_...) from https://simpleverifier.com/api-keys. Leave empty to sign in with OAuth instead. API and MCP access come with the Pro, Business and Agency plans: https://simpleverifier.com/pricing>"
}
}
}
}Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
SimpleVerifier MCP server
A remote Model Context Protocol server that gives ChatGPT, Claude, Cursor, VS Code and other MCP clients email and phone checks as tools.
- Endpoint:
https://simpleverifier.com/api/mcp(Streamable HTTP) - Auth: OAuth sign-in (ChatGPT, claude.ai, Claude Code) or
Authorization: Bearer <API key> - Plan: MCP and API access need a SimpleVerifier Pro, Business or Agency plan. Tool calls count against the plan's monthly API calls. Pricing
- Docs: https://simpleverifier.com/docs/mcp
This repo holds the registry manifest (server.json) and ready-to-copy client configs. The server itself is hosted; there is nothing to install or run.
Tools
| Tool | What it does |
|---|---|
verify_email | One address: valid, risky or invalid, with a reason. Syntax, domain, disposable and live mailbox (SMTP) checks. |
verify_emails | Up to 100 addresses in one call, deduplicated. Returns every result, or a job_id for get_job_results. |
get_job_results | Progress and per-address results of a verify_emails job, paged. |
check_phone_format | Format, E.164 form, country and numbering-plan line type. A format check only: it never says whether a number is in service. |
check_domain | A domain's MX, SPF and DMARC records, disposable status, and an optional catch-all probe. |
get_usage | Your plan, what it includes, this month's usage and the rate limit. |
Only valid means the mail server confirmed the mailbox. Anything unconfirmed (catch-all domains, providers that hide mailbox status, servers that don't answer) comes back risky.
Connect
Claude Code
claude mcp add --transport http simpleverifier https://simpleverifier.com/api/mcp
# then run /mcp inside a session to sign in, or pass a key:
claude mcp add --transport http simpleverifier https://simpleverifier.com/api/mcp --header "Authorization: Bearer YOUR_API_KEY"ChatGPT and claude.ai: add a custom connector with the URL https://simpleverifier.com/api/mcp, choose OAuth, then sign in on the SimpleVerifier screen. Step-by-step: https://simpleverifier.com/docs/mcp
Cursor, VS Code, Claude Desktop, Windsurf: copy the matching file from configs/:
| Client | File | Goes in |
|---|---|---|
| Cursor | cursor.mcp.json | ~/.cursor/mcp.json or .cursor/mcp.json |
| VS Code | vscode.mcp.json | .vscode/mcp.json (asks for the key once, stores it securely) |
| Claude Desktop | claude_desktop_config.json | Settings > Developer > Edit config (uses mcp-remote, needs Node.js) |
| Windsurf / Devin Desktop | windsurf.mcp_config.json | ~/.config/devin/mcp_config.json (older builds: ~/.codeium/windsurf/mcp_config.json) |
Create an API key at https://simpleverifier.com/api-keys. Keys start with sv_live_. Keep them out of shared config files and repositories.
Try it with curl
curl https://simpleverifier.com/api/mcp \
-H "Authorization: Bearer $SIMPLEVERIFIER_KEY" \
-H "Content-Type: application/json" \
-H "Accept: application/json, text/event-stream" \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"verify_email","arguments":{"email":"jane@company.com"}}}'Related
- REST API: https://simpleverifier.com/docs/api
- SDKs: Node.js, Python, PHP, Go, Ruby
- Support: support@simpleverifier.com
License
MIT for the files in this repo. The hosted service is covered by the SimpleVerifier terms.
Frequently asked questions
What is SimpleVerifier?
Verify email addresses with a live SMTP mailbox check, check phone number formats and email domains.
How do I install SimpleVerifier?
It runs as a remote server. In Claude Code: claude mcp add --transport http simpleverifier 'https://simpleverifier.com/api/mcp' --header 'Authorization: <Optional. Bearer followed by your SimpleVerifier API key (sv_live_...) from https://simpleverifier.com/api-keys. Leave empty to sign in with OAuth instead. API and MCP access come with the Pro, Business and Agency plans: https://simpleverifier.com/pricing>'. For other clients, paste the JSON configuration from this page into their MCP settings.
Does SimpleVerifier need an API key?
Yes. It expects Authorization, which you set in its configuration.
Is SimpleVerifier open source?
Yes. Its code is on GitHub under the MIT license.
Who maintains SimpleVerifier?
It is published by Ahmedmkarrar. AI.tn lists it but does not maintain or endorse it.
From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.