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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

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

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

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

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

{
  "mcpServers": {
    "email-deliverability-check": {
      "type": "http",
      "url": "https://spamfixer.com/mcp"
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=email-deliverability-check&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vc3BhbWZpeGVyLmNvbS9tY3AifQ%3D%3D"
}

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

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

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

Quality 96 / 100strong

protocol88 · weight 25

pass
protocol.modernsupports 2026-07-28 (server/discover)
pass
protocol.statelessanswers without a session
pass
protocol.transportstreamable HTTP
warn
protocol.list_ttltools/list declares ttlMs 0, so clients re-fetch it on every use

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.annotations1 of 1 tools declare readOnlyHint or destructiveHint
pass
tools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
pass
tools.token_costabout 215 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changes1 tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependenciesn/a · weight 15

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

1 tools, about 215 tokens to load them all · tool set 7f84aaceb3a4 · tools last changed 2026-10-28 · checked 2026-11-07 17:28 UTC

Tool changes

2026-10-28check_email_deliverabilitychangeddescription
before
Check why emails from a domain might land in spam. Looks up the domain's public DNS: SPF, DKIM (common selectors), DMARC, MX, and whether its mail servers are on major blocklists. Returns a 0-100 score and plain-English issues, worst first. Args: domain: The domain that sends the email, e.g. "joesplumbing.com". A website URL or an email address also works; the domain is taken from it.
after · 73% of words in common
Check why emails from a domain might land in spam. Looks up the domain's public DNS: SPF, DKIM (common selectors), DMARC, MX, and whether its mail servers are on major blocklists. Returns a 0-100 score and plain-English issues, worst first. Read-only: it changes nothing and sends no email. DKIM keys on custom selectors can't be found from outside, so "DKIM not found" is only a hint. Free email providers (gmail.com etc.) aren't checked. Args: domain: The domain that sends the email, e.g. "joesplumbing.com". A website URL or an email address also works; the domain is taken from it.

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 83 / 100

no-repository

provenance55

liveness100

freshness100

hygiene80

+dns-namespace +website +reachable +uptime-100% +updated-11d-ago -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://spamfixer.com/mcp` streamable-http	none	yes	100%	397 ms	2026-07-28	2026-11-07

Tools (1)

check_email_deliverabilityread-only Check why emails from a domain might land in spam. Looks up the domain's public DNS: SPF, DKIM (common selectors), DMARC, MX, and whether its mail servers are on major blocklists. Returns a 0-100 score and plain-English issues, worst first. Read-only: it changes nothing and sends no email. DKIM keys on custom selectors can't be found from outside, so "DKIM not found" is only a hint. Free email providers (gmail.com etc.) aren't checked. Args: domain: The domain that sends the email, e.g. "joesplumbing.com". A website URL or an email address also works; the domain is taken from it.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "com.spamfixer/email-deliverability-check",
  "title": "SpamFixer Email Deliverability Check",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://spamfixer.com/mcp",
      "type": "streamable-http"
    }
  ],
  "version": "1.0.0",
  "websiteUrl": "https://spamfixer.com/connector",
  "description": "Why do a domain's emails go to spam? Checks SPF, DKIM, DMARC, MX and blocklists. Free, no login."
}