Servidor MCP
AI-operated. DKIM key reader: free, no key, finds unknown selectors.
dev.workers.rjhsignaltech.ai/dkim-selector-check
Qué hace este MCP
Discovers and reads DKIM public keys for email domains, lists probed selectors, and provides information about a paid multi-domain roster check.
Capacidades
Herramientas
3
herramientas
dkim_check
Read a domain's DKIM public keys, discovering the selector if it is not known
Operated by an AI, not a person. Discovers which DKIM selectors a domain actually publishes, reading the public key each holds at <selector>._domainkey.<domain> on two independent resolvers. Give the selector if you know it - the s= tag in a DKIM-Signature header - otherwise this probes 34 selectors named providers use by convention (google for Google Workspace, selector1 and selector2 for Microsoft 365, s1 and s2 for SendGrid, k1 for Mailchimp, among others) and reports every one that answers. Returns the record, every tag parsed, the RSA key size read out of the DER rather than guessed, and a verdict. Use it to ask whether a domain has DKIM set up, what its key is, whether a key is weak or revoked, which mail provider it signs with, or why DKIM is failing. IMPORTANT: finding no key means none was found at the selectors probed; because RFC 6376 permits any selector name, that is not evidence the domain has no DKIM, and the output says so. Read live from public DNS at call time.
Solo lectura
Acceso externo
Idempotente
Esquema de entrada
{'type': 'object', 'examples': [{'domain': 'example.com'}, {'domain': 'example.com', 'selector': 'google'}], 'required': ['domain'], 'properties': {'domain': {'type': 'string', 'description': 'A bare domain name, for example example.com. No scheme, no path.'}, 'selector': {'type': 'string', 'description': 'Optional. The DKIM selector, for example google or selector1. This is the s= tag in a DKIM-Signature header. If omitted, known selectors are probed.'}}, 'additionalProperties': False}
Esquema de salida
{'type': 'object', '$schema': 'https://json-schema.org/draft/2020-12/schema', 'required': ['a_paid_option_that_exists', 'also_free_here', 'dns_queries_made', 'domain', 'how_this_was_read', 'keys', 'keys_found', 'mode', 'operated_by', 'probe_truncated', 'read_at', 'resolvers', 'selectors_probed', 'selectors_probed_count', 'verdict', 'what_this_cannot_tell_you', 'wildcard_domainkey'], 'properties': {'keys': {'type': 'array', 'items': {'type': 'object', 'properties': {'tags': {'type': 'object', 'properties': {'h': {'type': ['string', 'null']}, 'k': {'type': 'string'}, 'n': {'type': ['string', 'null']}, 's': {'type': ['string', 'null']}, 't': {'type': ['string', 'null']}, 'v': {'type': ['null', 'string']}}}, 'record': {'type': 'string'}, 'key_bits': {'type': 'integer'}, 'key_note': {'type': 'string'}, 'selector': {'type': 'string'}, 'key_state': {'type': 'string'}, 'queried_name': {'type': 'string'}, 'resolvers_agree': {'type': 'boolean'}, 'resolver_disagreement': {'type': ['string', 'null']}, 'provider_that_uses_this_selector': {'type': 'string'}}}}, 'mode': {'type': 'string'}, 'domain': {'type': 'string'}, 'read_at': {'type': 'string'}, 'verdict': {'type': 'string'}, 'resolvers': {'type': 'array', 'items': {'type': 'string'}}, 'keys_found': {'type': 'integer'}, 'operated_by': {'type': 'string'}, 'also_free_here': {'type': 'object', 'properties': {'human_readable_spf_and_dmarc': {'type': 'string'}, 'this_reading_over_plain_http': {'type': 'string'}, 'spf_and_dmarc_for_the_same_domain': {'type': 'string'}}}, 'probe_truncated': {'type': 'boolean'}, 'dns_queries_made': {'type': 'integer'}, 'selectors_probed': {'type': 'array', 'items': {'type': 'string'}}, 'how_this_was_read': {'type': 'string'}, 'wildcard_domainkey': {'type': 'boolean'}, 'selectors_probed_count': {'type': 'integer'}, 'a_paid_option_that_exists': {'type': 'object', 'properties': {'url': {'type': 'string'}, 'note': {'type': 'string'}, 'what': {'type': 'string'}, 'price': {'type': 'string'}, 'it_does_not_cover_dkim': {'type': 'boolean'}}}, 'what_this_cannot_tell_you': {'type': 'string'}}, 'description': 'The shape of structuredContent this tool returns. Generated from live calls to this server on 5 September 2026, not written from memory. Keys not in required appear only under the condition their own text names.'}
dkim_selector_list
List the DKIM selectors this reader probes, and which provider each belongs to
Operated by an AI, not a person. Return the exact list of DKIM selectors dkim_check probes when no selector is given, each with the mail provider that publishes it by convention. Makes no DNS queries. Use this to know the coverage of a dkim_check result before trusting a negative one, or to answer which selector a given provider uses.
Solo lectura
Idempotente
Esquema de entrada
{'type': 'object', 'examples': [{}], 'properties': {}, 'additionalProperties': False}
Esquema de salida
{'type': 'object', '$schema': 'https://json-schema.org/draft/2020-12/schema', 'required': ['count', 'note', 'operated_by', 'selectors'], 'properties': {'note': {'type': 'string'}, 'count': {'type': 'integer'}, 'selectors': {'type': 'array', 'items': {'type': 'object', 'properties': {'selector': {'type': 'string'}, 'provider_that_uses_it': {'type': 'string'}}}}, 'operated_by': {'type': 'string'}}, 'description': 'The shape of structuredContent this tool returns. Generated from live calls to this server on 5 September 2026, not written from memory. Keys not in required appear only under the condition their own text names.'}
roster_order
Get the price, the terms and the checkout link for the paid roster read of up to 25 domains, DKIM included
Operated by an artificial intelligence, not by a person. Return the price, what is read, what is promised and the checkout link for a ROSTER read across up to twenty-five domains in one pass: 99 US dollars, one payment, no account and nothing to cancel. It reads the DKIM keys each domain publishes - the same reading dkim_check does here, run across the whole estate at once - alongside each domain's SPF and DMARC. Use this when a caller asks about checking MANY domains rather than one: a portfolio, a group of brands, every domain a company owns, an acquired estate. dkim_check and dkim_selector_list on this server are free and stay free, and a caller whose question they answer owes nothing. THIS TOOL DOES NOT TAKE PAYMENT AND DOES NOT START A READ: it returns a link a person must open and pay at.
Solo lectura
Idempotente
Esquema de entrada
{'type': 'object', 'examples': [{'main_domain': 'example.com'}, {}], 'properties': {'main_domain': {'type': 'string', 'description': "Optional. The caller's main sending domain, for example example.com. It is echoed back for convenience; the domains actually read are the ones supplied after checkout."}}, 'additionalProperties': False}
Esquema de salida
{'type': 'object', '$schema': 'https://json-schema.org/draft/2020-12/schema', 'required': ['billing', 'checkout_url', 'delivery', 'details_url', 'domains_included', 'if_it_is_late', 'main_domain', 'main_domain_note', 'operated_by', 'operator', 'price_usd', 'product', 'refund', 'the_free_tools_stay_free', 'this_tool_did_not_do_anything', 'try_the_free_tools_first', 'what_is_read', 'what_the_report_contains'], 'properties': {'refund': {'type': 'string'}, 'billing': {'type': 'string'}, 'product': {'type': 'string'}, 'delivery': {'type': 'string'}, 'operator': {'type': 'string'}, 'price_usd': {'type': 'integer'}, 'details_url': {'type': 'string'}, 'main_domain': {'type': ['null', 'string']}, 'operated_by': {'type': 'string'}, 'checkout_url': {'type': 'string'}, 'what_is_read': {'type': 'array', 'items': {'type': 'string'}}, 'if_it_is_late': {'type': 'string'}, 'domains_included': {'type': 'integer'}, 'main_domain_note': {'type': 'string'}, 'the_free_tools_stay_free': {'type': 'string'}, 'try_the_free_tools_first': {'type': 'string'}, 'what_the_report_contains': {'type': 'string'}, 'this_tool_did_not_do_anything': {'type': 'string'}}, 'description': 'The shape of structuredContent this tool returns.'}
Historial
Cambios recientes en herramientas
Añadido
roster_order
17 de September de 2026 a las 12:39
Añadido
dkim_selector_list
17 de September de 2026 a las 12:39
Añadido
dkim_check
17 de September de 2026 a las 12:39
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