MCP.Market

Deliverability Doctor MCP server

online · 100% uptime
by Integrity-Os·io.github.Integrity-Os/deliverability-doctor·v1.0.2
No reviews yet

Check if a domain can be email-spoofed: SPF, DMARC, DKIM, MX graded from public DNS. Authless.

B77/100grade B
Write a reviewRun it
What users say
No reviews yet
Be the first
Safety scan
B77/100

full report

Adoption
New

0 stars

Reviews

Write one

Nobody has reviewed Deliverability Doctor yet.

If you have run it, two minutes of your experience saves the next person an afternoon.

Deliverability Doctor tools (2, 2 write)

write = sends, deletes, buys or posts
  • check_email_securitywrite actionFree

    Checks whether a domain can be email-spoofed, using public DNS only. Verifies SPF (including the RFC 7208 multiple-record permerror), DMARC policy and reporting, MX, and DKIM at common selectors. Returns a graded report with concrete fixes. Accepts a bare domain, a URL, or an email address. Nothing is sent to the domain.

  • compare_email_securitywrite actionFree

    Runs the email-security check on 2–5 domains and returns a comparison table with per-domain grades. Useful for checking your domain against competitors.

Public scan report

scanner v0.1.10 · 2026-10-31 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 246ms20/20
  • Tool poisoning2 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
  • Maintenancelast push 67 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 77/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Deliverability Doctor compares

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

Safety score
77/100
higher than 50% of 916 Email servers
Tools
2
the typical Email server has 7
Tools that change things
100%
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
58 ms
faster than 93% of 609 Email servers

What its tools let an agent do: 2 change

Install Deliverability Doctor in Claude Code, Cursor or VS Code

claude mcp add --transport http deliverability-doctor https://deliverability-doctor.deliverability-doctor.workers.dev/mcp
Add to Cursor

What the publisher says

From the Deliverability Doctor repository's README, as published. We do not edit it. Read it on GitHub

Deliverability Doctor

Remote MCP server: "Can my domain be email-spoofed?" answered from public DNS, graded, with concrete fixes. Connectable to Claude (custom connector) and ChatGPT (Apps SDK / MCP connector) — both speak MCP, one server serves both.

Tools

and redirect= handling), DMARC (policy, rua, pct), MX, DKIM at 7 common selectors. Graded A–F report, fixes per finding, upsell line only when problems exist. Accepts bare domain, URL, or email address.

  • checkemailsecurity(domain) — SPF (incl. RFC 7208 multiple-record permerror
  • compareemailsecurity(domains[2..5]) — comparison table with grades.

Design decisions

Lowest possible connect friction; nothing sensitive to protect.

  • Authless: reads public DNS only, stores nothing, takes nothing but a domain.

Node and on Cloudflare Workers — no dns module dependency.

  • DNS-over-HTTPS (Cloudflare → Google fallback): identical code runs on local

scale, trivial for clients.

  • Stateless streamable HTTP: fresh transport per request, no sessions; safe to

not be flagged), n8n.io (must grade A on p=reject), missing-everything domain (must grade F), NXDOMAIN (must refuse).

  • NXDOMAIN is refused, not graded — "domain doesn't exist" ≠ "spoofable".
  • Verified against known postures before first run: gmail.com (redirect= must

Run

npm install
node server.js          # :8787/mcp

Quick public demo: cloudflared tunnel --url http://localhost:8787 → use https://.trycloudflare.com/mcp as the connector URL.

Status 2026-08-23

(~5 min). Tunnel URL dies with the process/PC.

  • Local: end-to-end MCP verified (initialize / tools/list / tools/call).
  • Public: live via quick tunnel, initialize verified from the public URL.
  • Durable hosting: pending — Cloudflare Workers deploy needs Kacper's account

durable URL first, then Kacper's developer accounts.

  • Directory submissions (Anthropic connector directory, ChatGPT apps): need the

Monetization path

Free tool = distribution. Report links the $99 written audit (niekonieczny.gumroad.com/l/vscjt) only when problems are found. NOTE: Gumroad payouts currently frozen on Stripe KYC — unfreeze before promoting.

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

Deliverability Doctor: common questions

Is Deliverability Doctor MCP server safe?
Mostly: it is graded B (77/100). Read the Deliverability Doctor safety report
How do I install Deliverability Doctor?
It runs remotely at deliverability-doctor.deliverability-doctor.workers.dev. 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 Deliverability Doctor need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Deliverability Doctor maintained?
The last commit was 70 days ago (2026-08-26). The latest release is v1.0.2.
Is Deliverability Doctor 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 Deliverability Doctor?
Servers from other publishers that do the same job: e2a — email for AI agents MCP server, e2a — email for AI agents MCP server and ContrastAPI MCP server.
How does Deliverability Doctor compare with other Email MCP servers?
safety score 77/100 (higher than 50% of 916 Email servers); tools 2 (the typical Email server has 7); tools that change things 100% (typical: 25%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Deliverability Doctor

Same job from other publishers: the closest match first, then the best rated.

  • e2a — email for AI agents
    Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM verified.
    A
  • e2a — email for AI agents
    Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM verified.
    A
  • ContrastAPI
    55 tools, 7 Resources, Sigma rules, email SPF/DMARC, MITRE, CVE/KEV, risk_score. No key.
    B
  • Palisade
    Monitor and manage email authentication (SPF, DKIM, DMARC, MTA-STS, BIMI) for your domains.
    A
  • Forward Email
    Privacy-focused email: domains, DNS verification, aliases, SMTP sending, mailboxes and calendars.
    A