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Email Spam Tester MCP server

online · 100% uptime
by serg-tanichev·io.github.serg-tanichev/email-spam-tester·v1.0.0·2 stars
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Test an email before it goes out: a disposable address, 41 checks with RFC citations, a fix plan.

A88/100grade A
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Safety scan
A88/100

full report

Adoption
Growing

2 stars

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Email Spam Tester tools (4)

write = sends, deletes, buys or posts
  • get_message_sourceFree

    The message exactly as it was received: headers, both bodies, source. Useful when a finding points at a header and the agent needs to see what it actually sent rather than what it believes it sent, or to find the confirmation link in a welcome letter.

  • get_reportFree

    Read a report by its slug without waiting, with provider placement so far. Works for one-hour tests and for letters in the person's series mailboxes.

  • get_test_addressFree

    Reserve a single-use address to send a draft email to, for a full check. Returns the address and the URL its report will appear at. The address accepts exactly one message and expires after an hour. The email has to be sent by the person, from the platform or mailbox they really send from: half the checks read what that platform adds. The report covers 42 checks (SPF, DKIM, DMARC, reverse DNS, TLS, blocklists, content, links, the Gmail and Yahoo bulk-sender rules) and a plan of what to fix. lang is decided now because the message arrives minutes later over SMTP, which carries no hint of who is waiting for it. What wait_for_report returns quotes check lines in English whatever it is set to; the person following report_url sees their own language.

  • wait_for_reportFree

    Wait until the message arrives and has been analysed, then summarise it. Call it after the email has been sent to the address from get_test_address. Blocks rather than returning "not ready yet": an agent told to poll writes a sleep loop and usually gives up before the analysis finishes. Provider placement keeps filling in for up to 30 minutes after the report; get_report reads the latest.

Public scan report

scanner v0.1.10 · 2026-10-02 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 817ms20/20
  • Tool poisoning4 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 2 days ago15/15
  • Maintainer identityregistry namespace matches repository owner6/10
Overall 88/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Email Spam Tester compares

Against every graded Email MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
88/100
higher than 82% of 916 Email servers
Tools
4
the typical Email server has 7
Tools that change things
0%
typical: 25%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote Email server answers 100%
Response time
91 ms
faster than 87% of 609 Email servers
GitHub stars
2
more than 75% of 493 Email servers

What its tools let an agent do: 4 read

Install Email Spam Tester in Claude Code, Cursor or VS Code

claude mcp add --transport http email-spam-tester https://email-spam-tester.com/mcp
Add to Cursor

What the publisher says

From the Email Spam Tester repository's README, as published. We do not edit it. Read it on GitHub

Email Spam Tester MCP server

Email Spam Tester is a free, independent email deliverability testing tool built by Serhii Tanichev. This repository is the client side of its MCP server: how to connect an agent to it, what the four tools do, and how to read what they return. There is nothing to install on a server; the MCP endpoint is hosted with the tool.

  • Site: https://email-spam-tester.com/
  • Agent guide: https://email-spam-tester.com/skill/
  • API and examples: https://github.com/serg-tanichev/email-spam-tester

The service exposes an MCP server at https://email-spam-tester.com/mcp over streamable HTTP. No key, no account. Four tools:

The agent's job in between is to send a real message to the address, from the platform that will send the campaign. Half the checks read headers the sending platform adds, so a copy sent from a laptop says little about it.

Claude Desktop

Add the server to claudedesktopconfig.json (see claude-desktop.json for the whole file):

{
  "mcpServers": {
    "email-spam-tester": {
      "url": "https://email-spam-tester.com/mcp"
    }
  }
}

Clients that do not speak streamable HTTP directly can bridge it with mcp-remote:

{
  "mcpServers": {
    "email-spam-tester": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://email-spam-tester.com/mcp"]
    }
  }
}

Claude Code

claude mcp add --transport http email-spam-tester https://email-spam-tester.com/mcp

Reading what comes back

  • The per-check lines the tools return are in English whatever lang was set to; lang decides what the person opening the report URL sees.
  • A check status of skip is not a pass: the check did not apply. error means it could not run and is left out of the score.
  • complete: false means something could not be checked. Treat the score as optimistic until it is true.
  • The slug is the capability: whoever holds it can read the report, including the subject, the sender, the bounce address and the full source. Do not test somebody else's mail without asking.

The same instructions, written for an agent to read before it starts, are in SKILL.md, and in the project repository serg-tanichev/email-spam-tester.

Where it is listed

  • MCP Registry, the official one, as io.github.serg-tanichev/email-spam-tester
  • Smithery
  • Glama

Files

  • claude-desktop.json: a complete Claude Desktop configuration with the server added.
  • server.json: the manifest in the MCP registry format, for registries and directories that read one.

License

MIT, see LICENSE. The license covers this repository, not the service.

Nothing above is checked by us. What we check is on the safety report.

Grade history

  • 2026-09-19restoreB → Ascore 88
  • 2026-09-19restoreD → Bscore 79: Write-action tools reachable without authentication

Email Spam Tester: common questions

Is Email Spam Tester MCP server safe?
Yes, by our scan: it is graded A (88/100). Read the Email Spam Tester safety report
How do I install Email Spam Tester?
It runs remotely at email-spam-tester.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Email Spam Tester need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Email Spam Tester maintained?
The last commit was 35 days ago (2026-09-30). The latest release is v1.0.0.
Is Email Spam Tester up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Email Spam Tester?
Servers from other publishers that do the same job: Email Footer Law Lint MCP server, Emailens MCP server and ReplyLayer MCP server. Compare all Email Spam Tester alternatives.
How does Email Spam Tester compare with other Email MCP servers?
safety score 88/100 (higher than 82% of 916 Email servers); tools 4 (the typical Email server has 7); tools that change things 0% (typical: 25%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Email Spam Tester

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All Email Spam Tester alternatives →
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