Email Check MCP Server

by kaiv Your server? Claim it

answering

Email Check is answering right now. Last checked 1 min ago. It exposes 4 tools.

Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

Uptime history 57 days of history · worst day 93%

57 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

142 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check 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.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add email-check --transport http https://api.kaiv.ai/api/bridge/mcp/email-check-b6ab5250

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "email-check": {
      "url": "https://api.kaiv.ai/api/bridge/mcp/email-check-b6ab5250"
    }
  }
}

~/.codex/config.toml

[mcp_servers.email-check]
url = "https://api.kaiv.ai/api/bridge/mcp/email-check-b6ab5250"

.cursor/mcp.json

{
  "mcpServers": {
    "email-check": {
      "url": "https://api.kaiv.ai/api/bridge/mcp/email-check-b6ab5250"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "email-check": {
      "url": "https://api.kaiv.ai/api/bridge/mcp/email-check-b6ab5250"
    }
  }
}

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.

dmarc

get_dmarc_record

DMARC record, policy, and whether it actually protects. Returns the DMARC TXT record at _dmarc.<domain>, its policy (none / quarantine / reject), the percentage it applies to, and whether that policy protects against spoofing. Also flags the case of MULTIPLE DMARC records, which RFC 7489 requires receivers to treat as no policy at all — a domain in that state is unprotected however strict its records look. A policy of "none" is monitoring only and does not stop forged mail. Use when assessing whether mail claiming to be from a domain can be trusted.

check_email_domain

Full email posture for a domain: can it receive mail, and can it be spoofed? Runs MX, SPF and DMARC lookups together and returns a plain-language verdict alongside the raw records: can_receive_mail, spoofable, and a list of specific findings. Use this as the default check before emailing an unfamiliar domain, when judging whether inbound mail claiming to be from a domain could be forged, or when auditing your own domains. Prefer this over the single-record tools unless you already know which record you need.

records

get_mx_records

Mail exchanger records for a domain. Returns the MX hosts in priority order and whether any exist. A domain with no MX records cannot receive mail, so sending to it will bounce. Use when you only need deliverability and not spoofing posture; use check_email_domain for the full picture.

spf

get_spf_record

SPF record and how strict it is. Returns the SPF TXT record, the qualifier on its `all` mechanism (fail / softfail / neutral / pass) and what that means in practice, plus whether more than one SPF record exists — which receivers treat as an error, leaving the domain unprotected. Use when diagnosing why mail from a domain is being rejected or marked.

Endpoints

URL	Transport	State	Latency	Checked
https://api.kaiv.ai/api/bridge/mcp/email-check-b6ab5250	streamable-http	answering	73 ms	1 min ago

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Email Check — questions

Answers built from our own checks of this server.

What can Email Check do?

It exposes 4 tools, read directly from the server on our last check. Among them: check_email_domain, get_dmarc_record, get_mx_records, get_spf_record. 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 Email Check working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 142 ms. The bar chart above shows every period we have measured.

How do I connect 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 Email Check need an API key?

No. 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 Email Check?

It answers our handshake in 142 ms on average, which is faster than 76% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.