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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "email-deliverability": {
      "type": "http",
      "url": "https://themailx.com/mcp"
    }
  }
}

claude mcp add --transport http email-deliverability https://themailx.com/mcp

[mcp_servers.email-deliverability]
url = "https://themailx.com/mcp"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "email-deliverability": {
      "type": "remote",
      "url": "https://themailx.com/mcp",
      "enabled": true
    }
  }
}

{
  "mcpServers": {
    "email-deliverability": {
      "type": "http",
      "url": "https://themailx.com/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=email-deliverability&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vdGhlbWFpbHguY29tL21jcCJ9"
}

{
  "servers": {
    "email-deliverability": {
      "type": "http",
      "url": "https://themailx.com/mcp"
    }
  }
}

{
  "mcpServers": {
    "email-deliverability": {
      "httpUrl": "https://themailx.com/mcp"
    }
  }
}

extensions:
  "email-deliverability":
    enabled: true
    name: "email-deliverability"
    type: streamable_http
    uri: "https://themailx.com/mcp"
    timeout: 300

Quality 75 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene100 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
pass
tools.annotations17 of 17 tools declare readOnlyHint or destructiveHint
pass
tools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
pass
tools.token_costabout 2,856 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability25 · weight 15

warn
stability.changes17 tool changes in 30 days
fail
stability.rug_pull16 tools kept their name but changed most of their description in 30 days; review before trusting them

dependenciesn/a · weight 15

n/a
deps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI package

17 tools, about 2,856 tokens to load them all · tool set 5d00200484e9 · tools last changed 2026-10-14 · checked 2026-10-20 13:17 UTC

Tool changes

2026-10-14audit_domainadded
Use this when the user asks why their emails go to spam or wants a full deliverability check of a domain. Runs SPF, DKIM (finds the selector on its own), DMARC, blacklist and MX checks in one call and returns pass, warning or fail for each, an overall result, and the fixes to apply in priority order with help links. Takes about 10 seconds. mailX never changes DNS.
2026-10-12dns_lookupchangeddescriptionmeaning changed
before
Look up all DNS records for a domain in one query. Returns A, AAAA, CNAME, MX, NS, TXT, and SOA records.
after · 44% of words in common
Use this when the user wants every DNS record for a domain in one view (A, AAAA, CNAME, MX, NS, TXT, SOA). Returns the live records grouped by type.
2026-10-12ptr_lookupchangeddescriptionmeaning changed
before
Reverse DNS lookup. Find the hostname associated with an IP address. A valid PTR record is important for email sending reputation.
after · 32% of words in common
Use this when the user wants the reverse DNS (PTR) of an IP address, for example to check a sending server's reverse DNS. Returns the hostname the IP resolves to.
2026-10-12cname_lookupchangeddescriptionmeaning changed
before
Look up CNAME (Canonical Name) records for a domain. Shows where a hostname aliases to.
after · 14% of words in common
Use this when the user wants to know whether a hostname is an alias of another one, for example to verify DKIM or tracking CNAMEs. Returns the live CNAME target.
2026-10-12txt_lookupchangeddescriptionmeaning changed
before
Look up all TXT records for a domain. TXT records contain SPF policies, domain verification tokens, DKIM keys, and other metadata.
after · 31% of words in common
Use this when the user wants to see a domain's TXT records, for example to find verification tokens or check what SPF or other policies are published. Returns all live TXT records.
2026-10-12mx_lookupchangeddescriptionmeaning changed
before
Look up MX (Mail Exchanger) records for a domain. Returns the mail servers and their priorities.
after · 39% of words in common
Use this when the user wants to know which mail servers receive email for a domain. Returns the domain's live MX records with their priorities.
2026-10-12blacklist_checkchangeddescriptionmeaning changed
before
Check if a domain or IP address is listed in popular email blacklists (DNSBLs). Being blacklisted can severely impact email deliverability.
after · 10% of words in common
Use this when the user suspects their domain is blacklisted or blocked. Checks the domain against major DNS blocklists and returns the result for each list.
2026-10-12imap_finderchangeddescription, annotationsmeaning changed
before
Look up IMAP server settings (host, port, encryption) for a given email provider. Use this to find the correct IMAP configuration for services like Gmail, Outlook, Yahoo, etc.
after · 30% of words in common
Use this when the user needs the incoming mail (IMAP) server settings for an email provider, such as Gmail, Outlook, Yahoo, iCloud or Zoho. Returns the host, ports with encryption and the provider's setup guide. Never asks for the user's credentials.
2026-10-12smtp_finderchangeddescription, annotationsmeaning changed
before
Look up SMTP server settings (host, port, encryption) for a given email provider. Use this to find the correct SMTP configuration for services like Gmail, Outlook, SendGrid, etc.
after · 27% of words in common
Use this when the user needs the outgoing mail (SMTP) server settings for an email provider or sending service, such as Gmail, Outlook, Microsoft 365, Zoho, Amazon SES or SendGrid. Returns the host, ports with encryption, what to use to log in, and the provider's setup guide. Never asks for the user's credentials.
2026-10-12imap_checkchangeddescriptionmeaning changed
before
Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration.
after · 22% of words in common
Use this only when the user explicitly asks to test an IMAP login for a mailbox they control and provides its credentials. Connects to the IMAP server and reports whether connection, encryption and authentication succeed. Credentials are not stored.

Showing the latest 10. Full history: list_changes · trend: quality JSON.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 72 / 100

no-repository

provenance55

liveness100

freshness45

hygiene80

+dns-namespace +website +reachable +uptime-100% -stale-186d -no-repository

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://themailx.com/mcp` streamable-http	none	yes	100%	341 ms	2025-11-25	2026-10-20

Tools (17)

`audit_domain`read-only	Use this when the user asks why their emails go to spam or wants a full deliverability check of a domain. Runs SPF, DKIM (finds the selector on its own), DMARC, blacklist and MX checks in one call and returns pass, warning or fail for each, an overall result, and the fixes to apply in priority order with help links. Takes about 10 seconds. mailX never changes DNS.
`bimi_check`read-only	Use this when the user asks about BIMI or showing a brand logo next to their emails in inboxes. Returns the live BIMI record, the logo URL it declares, and a fix suggestion.
`blacklist_check`read-only	Use this when the user suspects their domain is blacklisted or blocked. Checks the domain against major DNS blocklists and returns the result for each list.
`cname_lookup`read-only	Use this when the user wants to know whether a hostname is an alias of another one, for example to verify DKIM or tracking CNAMEs. Returns the live CNAME target.
`dkim_check`read-only	Use this when the user wants to verify DKIM for a domain. Pass the DKIM selector if known (for example google for Google Workspace, selector1 or selector2 for Microsoft 365). If the selector is unknown, omit it: mailX then tries common selectors and returns the ones it finds. Returns the published key and its status. A miss on common selectors does not prove DKIM is absent.
`dmarc_check`read-only	Use this when the user asks about DMARC, spoofing protection, or what happens to emails that fail authentication. Returns the live DMARC record, its policy and a fix suggestion.
`dmarc_generate`read-only	Use this when the user needs a DMARC record. Returns the record name, value and type ready to publish. mailX does not publish it.
`dns_lookup`read-only	Use this when the user wants every DNS record for a domain in one view (A, AAAA, CNAME, MX, NS, TXT, SOA). Returns the live records grouped by type.
`imap_check`	Use this only when the user explicitly asks to test an IMAP login for a mailbox they control and provides its credentials. Connects to the IMAP server and reports whether connection, encryption and authentication succeed. Credentials are not stored.
`imap_finder`read-only	Use this when the user needs the incoming mail (IMAP) server settings for an email provider, such as Gmail, Outlook, Yahoo, iCloud or Zoho. Returns the host, ports with encryption and the provider's setup guide. Never asks for the user's credentials.
`mx_lookup`read-only	Use this when the user wants to know which mail servers receive email for a domain. Returns the domain's live MX records with their priorities.
`ptr_lookup`read-only	Use this when the user wants the reverse DNS (PTR) of an IP address, for example to check a sending server's reverse DNS. Returns the hostname the IP resolves to.
`smtp_check`	Use this only when the user explicitly asks to test an SMTP login for a mail account they control and provides its credentials. Connects to the SMTP server and reports whether connection, encryption and authentication succeed. If from_email and to_email are both given, it also sends one test email. Credentials are not stored.
`smtp_finder`read-only	Use this when the user needs the outgoing mail (SMTP) server settings for an email provider or sending service, such as Gmail, Outlook, Microsoft 365, Zoho, Amazon SES or SendGrid. Returns the host, ports with encryption, what to use to log in, and the provider's setup guide. Never asks for the user's credentials.
`spf_check`read-only	Use this when the user asks whether a domain's SPF record is valid, which servers may send email for a domain, or why SPF fails. Returns the live SPF record, a pass/fail status and a fix suggestion.
`spf_generate`read-only	Use this when the user needs a new SPF record for their email provider. Returns a TXT record ready to publish, or explains what to set up instead when the provider does not need a root SPF include. mailX does not publish it.
`txt_lookup`read-only	Use this when the user wants to see a domain's TXT records, for example to find verification tokens or check what SPF or other policies are published. Returns all live TXT records.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "com.themailx/email-deliverability",
  "title": "MailX Email Deliverability",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://themailx.com/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "1.0.0",
  "websiteUrl": "https://themailx.com",
  "description": "Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records."
}