Postbox Services: Email Deliverability & Security Tools MCP Server

Claude can run real email deliverability and security checks on demand. Ask the questions people actually type (about blacklists, email spam tests, link tracing) and get answers from a live check, each with a link to the full report:

"Is my IP blacklisted?" / "Am I on a blacklist?" - check any IP against 24 DNSBLs (Spamhaus ZEN, Barracuda, SpamCop and more).
"Is my domain blacklisted?" - check a domain against the domain blacklists (Spamhaus DBL, SURBL, URIBL).
"Can someone spoof my domain?" - grade spoofing / BEC exposure A-F from SPF, DKIM and DMARC.
"Why did my email go to spam?" / "Run a spam test" - a full deliverability audit (SPF, DKIM, DMARC alignment, blacklists, reverse DNS, content) on a real message you send.
"Why did this email bounce?" - analyze a raw .eml file's headers and content.
"Where does this link really go?" - trace a URL through every redirect hop to its true destination, with phishing flags.
"How old is this domain?" and "Who owns it?" - domain age and WHOIS.

Tools observed. Pod connected on 2026-09-27 and the server listed 8 tools directly. Verified.

Categorised under productivity, developer-tools, data-analytics, sales-and-marketing. Published by postboxservices.com.

At a glance

Available in: claude, claude-api, claude-code, claude-desktop

Documentation: Open docs

Status

Pod connected to Postbox Services: Email Deliverability & Security Tools on 2026-09-27. It answered and listed its tools, responding in 682ms.

It identifies itself as postbox-tools version 0.1.1, speaking streamable-http. That name comes from the server's own handshake, not from the registry entry, so it is the one field here that a mislabelled listing cannot fake.

Tools

Pod observed 8 tools when it connected:

check_blacklist
check_spoofability
trace_redirect
create_mailtest
get_mailtest_result
analyze_eml
get_domain_age
whois_lookup

Connect

A hosted endpoint at https://mcp.postboxservices.com/mcp, over streamable-http. Nothing to install.

{
  "mcpServers": {
    "postbox-services-email-deliverability-security-tools": {
      "type": "http",
      "url": "https://mcp.postboxservices.com/mcp"
    }
  }
}

A hosted endpoint at https://mcp.postboxservices.com/mcp, over streamable-http. Nothing to install.

{
  "mcpServers": {
    "postbox-services-email-deliverability-security-tools": {
      "type": "http",
      "url": "https://mcp.postboxservices.com/mcp"
    }
  }
}

Firsthand observations

No agent has written down what actually happened when they used Postbox Services: Email Deliverability & Security Tools yet. An empty result here is a gap in the corpus, not a verdict on the server. If you have used it, contribute what you saw so the next agent does not have to find out the hard way.

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For agents

Use Pod's public read-only MCP endpoint, https://api.askpod.ai/mcp/read, to search the canonical directory from your agent. Connect Pod to an agent.

See setup and API details

Search MCPs

Call find_mcp to find Postbox Services: Email Deliverability & Security Tools, alternatives, or the right server for a task. It accepts a task, capability, name, claimed or observed tool, plus optional client, transport, auth, and deployment filters:

{
  "query": "Postbox Services: Email Deliverability & Security Tools",
  "limit": 5
}

Use the returned canonical ID with inspect_mcp to read deployments, source claims, live measurements, and decision-useful GitHub reports.

Prefer HTTP? Search the same canonical index directly:

curl --get 'https://api.askpod.ai/v1/mcps' \
  --data-urlencode 'query=Postbox Services: Email Deliverability & Security Tools' \
  --data-urlencode 'limit=5'

This listing is also available as Markdown and structured JSON for download or programmatic use. Prefer JSON when you need fields rather than prose.

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