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InboxGuards Email Check MCP Server

by inboxguardstest-api Your server? Claim it
answering

InboxGuards Email Check is answering right now. Last checked 15 min ago. It exposes 4 tools.

Check emails before you send, and get a $1 SPF/DKIM/DMARC fix plan for your domain. Pay per call.

Uptime history 5 days of history
5 days agonow
100.0%
Uptime 24h
91 of 91 checks
4
Tools
read from the server
359 ms
Response time
average over 24h
open, no key
Access
streamable-http

What changed 2

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 14 October 2026. No other catalogue keeps this.

14 Oct a tool appeared email_fix_plan
14 Oct a tool changed version

Nothing serious here today

Today is the operative word: we check InboxGuards Email Check every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

run in your terminal
claude mcp add email --transport http https://api.inboxguardstest.com/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "email": {
      "url": "https://api.inboxguardstest.com/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.email]
url = "https://api.inboxguardstest.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "email": {
      "url": "https://api.inboxguardstest.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "email": {
      "url": "https://api.inboxguardstest.com/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

email
check_email_address
Check one email address before you send to it: syntax, whether the domain accepts mail (MX, null MX or implicit A record), a disposable-domain flag (public CC0 list of about 9,900 domains), a role-account flag (info@, support@, noreply@...) and a free-provider flag. Returns a verdict of ok, risky or undeliverable with plain reasons. Use validate_email first if you only need syntax. No SMTP probe is made and no mail is sent, so it cannot confirm the mailbox exists. The address is not stored or logged. Read-only; one live DNS lookup via Cloudflare DoH. Costs $0.005 USDC per call via x402 (payment goes in _meta["x402/payment"]); invalid input or a DNS failure returns an error and is not charged.
email_fix_plan
Get an email security fix plan for one domain: the exact SPF, DKIM and DMARC DNS records to publish (create / replace / keep, record name, value and why), in order, plus click-path steps for the domain's DNS host (Cloudflare, GoDaddy, Route 53, Namecheap, Squarespace/Google, Vercel and others). Reads live MX, NS, SPF, DKIM and DMARC; detects Google Workspace, Microsoft 365, Zoho, Proton, Fastmail, GoDaddy and Cloudflare Email Routing; merges SPF within the 10-lookup limit, keeps existing senders, and stages DMARC none -> quarantine -> reject. Domains that send no mail get a lock-down set. Use it when mail lands in spam, before a DMARC rollout, or for a client. DKIM keys are generated by the mail provider, so for those it gives the exact console path. Read-only; nothing is stored. Costs $1 USDC per call via x402 (payment goes in _meta["x402/payment"]); invalid input, an unknown domain or a DNS failure returns an error and is not charged.
pricing
pricing
Free. Return the price of check_email_address (and of the HTTP-only email test report), the payment network (Base) and the receiving address. No input, no network request, no payment.
validate
validate_email
Free. Check the syntax of an email address offline and get the normalized address and domain, before paying for check_email_address. No DNS lookup, no network request, no payment.

Endpoints

URLTransportStateLatencyChecked
https://api.inboxguardstest.com/mcp streamable-http answering 97 ms 15 min ago

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InboxGuards Email Check — questions

Answers built from our own checks of this server.

What can InboxGuards Email Check do?
It exposes 4 tools, read directly from the server on our last check. Among them: check_email_address, email_fix_plan, pricing, validate_email. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is InboxGuards Email Check working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 359 ms. The bar chart above shows every period we have measured.
How do I connect InboxGuards Email Check?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does InboxGuards Email Check need an API key?
No. InboxGuards Email Check completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is InboxGuards Email Check?
It answers our handshake in 359 ms on average, which is faster than 37% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.