SimpleVerifier

io.github.AhmedmkarrarPublished by GitHub account Ahmedmkarrarv1.2.0Updated Oct 26, 2026

Verify email addresses with a live SMTP mailbox check, check phone number formats and email domains.

VerifiedStreamable HTTPWeb executableCommunication & CollaborationBusiness & Commerce

Overview

AI-generated overview

Remote MCP server that lets an assistant verify email addresses with live SMTP checks, validate phone number formats and inspect email domains.

What you can do
  • Verify a single email address as valid, risky or invalid, with syntax, domain, disposable and live mailbox checks
  • Verify up to 100 addresses in one call, then poll a job for paged per-address results
  • Check phone number format, E.164 form, country and line type (format only, not whether it is in service)
  • Inspect a domain's MX, SPF and DMARC records, disposable status and optional catch-all probe
  • Read the account's plan, monthly usage and rate limit
When to use it
Useful when an assistant needs to clean or qualify contact lists, screen signups for disposable or undeliverable addresses, or sanity-check phone and domain data before outreach or import.
Requirements
A hosted remote endpoint; nothing to install. Authentication is OAuth sign-in or an Authorization bearer API key created in the SimpleVerifier account. MCP and API access require a Pro, Business or Agency plan, and tool calls count against the plan's monthly API call quota. Network access is required.
Before you install
The API key is a secret and should be kept out of shared config files and repositories. Tool calls consume the plan's monthly API quota, so bulk verification of up to 100 addresses per call can use it up quickly. Email addresses and domains submitted for verification are sent to a third-party service.

Installation

In SourceWeft

  1. Open SimpleVerifier in the dashboard and add it to a workspace.
  2. Connect the required credentials. They are stored privately and never shown on public pages.
  3. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.Ahmedmkarrar%2Fsimpleverifier/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "simpleverifier": {
      "type": "http",
      "url": "https://simpleverifier.com/api/mcp"
    }
  }
}

README

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

ToolWhat it does
verify_emailOne address: valid, risky or invalid, with a reason. Syntax, domain, disposable and live mailbox (SMTP) checks.
verify_emailsUp to 100 addresses in one call, deduplicated. Returns every result, or a job_id for get_job_results.
get_job_resultsProgress and per-address results of a verify_emails job, paged.
check_phone_formatFormat, E.164 form, country and numbering-plan line type. A format check only: it never says whether a number is in service.
check_domainA domain's MX, SPF and DMARC records, disposable status, and an optional catch-all probe.
get_usageYour 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

bash
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/:

ClientFileGoes in
Cursorcursor.mcp.json~/.cursor/mcp.json or .cursor/mcp.json
VS Codevscode.mcp.json.vscode/mcp.json (asks for the key once, stores it securely)
Claude Desktopclaude_desktop_config.jsonSettings > Developer > Edit config (uses mcp-remote, needs Node.js)
Windsurf / Devin Desktopwindsurf.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

bash
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":"[email protected]"}}}'

Related

License

MIT for the files in this repo. The hosted service is covered by the SimpleVerifier terms.

Source: README.md at commit 00eef45

Tools

0
This server asks you to sign in, so SourceWeft could not read its tools without an account and has not indexed them. What a connected account sees can depend on that account and its permissions.

Version history

1
  1. v1.2.0LatestOct 25, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts