Couryo free email tools
Free, no login: verify an email address, check SPF/DKIM/DMARC, explain SMTP errors, build SPF/DMARC.
| Endpoint | https://mcp.couryo.com/tools (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 6 tools · grade A (91) · pin ts_e2306713018ccbfc88c51548a05320bd · protocol 2025-06-18 |
| First / last listed | 2026-10-28 03:40 UTC / 2026-10-28 03:40 UTC |
| Grade over time | 2026-10-28: A (91), 6 tools |
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Tools: verify_email verify_emails check_domain_dns explain_smtp_error generate_spf generate_dmarc
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-ma params: email* |
verify_emails | Batch of verify_email: the same checks for up to 100 addresses at once, one verdict each (valid, risky, invalid) plus the totals. Run it before a send and drop invalid and disposable addresses. Each address counts in the daily limit. Free, read only. / Confere até 100 endereços de uma vez antes de um envio. params: emails* |
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 params: domain*, dkim_selector |
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. params: message* |
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. params: includes, ip4, ip6, mx, a, policy |
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. params: domain*, policy*, rua, pct, subdomain_policy |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.