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Couryo free email tools MCP Server

by couryo Your server? Claim it
answering

Couryo free email tools is answering right now. Last checked moments ago. It exposes 5 tools.

Free, no login: verify an email address, check SPF/DKIM/DMARC, explain SMTP errors, build SPF/DMARC.

Uptime history 50 hours of history
50 hours agonow
100.0%
Uptime 24h
92 of 92 checks
5
Tools
read from the server
375 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check Couryo free email tools 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 0 min ago.

run in your terminal
claude mcp add tools --transport http https://mcp.couryo.com/tools
Settings → Connectors → Add custom connector, then paste this address
https://mcp.couryo.com/tools
~/.codex/config.toml
[mcp_servers.tools]
url = "https://mcp.couryo.com/tools"
.cursor/mcp.json
{
  "mcpServers": {
    "tools": {
      "url": "https://mcp.couryo.com/tools"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "tools": {
      "type": "http",
      "url": "https://mcp.couryo.com/tools"
    }
  }
}

Available tools 5

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

generate
generate_dmarc
Builds one DMARC record (TXT at _dmarc.<domain>). Start with policy none and a report address (rua), read the reports, then move to quarantine and reject once every legitimate sender passes SPF or DKIM aligned. Free, no network. / Monta o registro DMARC; comece com p=none e suba para quarantine e reject.
generate_spf
Builds one SPF record (TXT at the domain) from the services that send for it: includes, IPv4 and IPv6, mx and a. Starts with ~all (softfail), the safe choice; use policy fail (-all) once every sender is listed. Remember the limit of 10 DNS lookups (each include costs at least one). Free, no network. / Monta o registro SPF a partir dos serviços que enviam pelo domínio.
domain
check_domain_dns
Checks the email setup of any domain: SPF (one record, ending, the 10 DNS lookup limit), DKIM on the common selectors (or dkim_selector), DMARC policy and reports, MX and mailbox provider, MTA-STS, TLS-RPT and BIMI. Answers a 0 to 100 score, a grade, the fix for each problem in plain words and records ready to copy. Free, read only. / Confere SPF, DKIM, DMARC e MX de qualquer domínio, com nota e a correção de cada problema.
explain
explain_smtp_error
Explains a bounce or SMTP error text ("550 5.7.515 Access denied", "452 4.2.2 mailbox full") in plain words: hard (the address does not work), soft (temporary) or policy (a provider rule, not the address), the provider and the next step. Free, read only. / Explica uma devolução ou erro SMTP em linguagem simples, com o próximo passo.
verify
verify_email
Checks one email address without sending anything: format, typo in big providers ("gmail.com.br" → "gmail.com", "hotmial.com"), disposable inbox, shared mailbox (contato@, sales@) and whether the domain receives email (MX). Verdict valid, risky or invalid, with did_you_mean. The mailbox itself is never probed. Free, read only. / Confere um endereço sem enviar nada: formato, erro de digitação, e-mail temporário, caixa compartilhada e se o domínio recebe e-mail.

Endpoints

URLTransportStateLatencyChecked
https://mcp.couryo.com/tools streamable-http answering 364 ms 0 min ago

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E
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SPF, DKIM, DMARC, MTA-STS and domain-expiry checks for any domain, with SPF lookup counts.

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Couryo free email tools — questions

Answers built from our own checks of this server.

What can Couryo free email tools do?
It exposes 5 tools, read directly from the server on our last check. Among them: check_domain_dns, explain_smtp_error, generate_dmarc, generate_spf, verify_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 Couryo free email tools 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 375 ms. The bar chart above shows every period we have measured.
How do I connect Couryo free email tools?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Couryo free email tools need an API key?
No. Couryo free email tools completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Couryo free email tools?
It answers our handshake in 375 ms on average, which is faster than 39% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.