Security & Testing

warminboxes.com

Validates a domain's email authentication and deliverability records—SPF, DKIM, DMARC, and BIMI—to assess cold email readiness.

1 endpoint18 known toolsFirst detected October 1, 2026Last detected October 1, 2026

ENDPOINT 1

https://warminboxes.com/mcp

No auth detected

MCP server metadata

Name: warminboxes-deliverability-tools
Version: 1.0.0

Capabilities

tools

Server instructions

Free cold-email deliverability checks from warminboxes.com. No API key, no signup, no rate limit worth worrying about. Use these to answer questions about whether a domain is set up to send email and whether it is likely to inbox: authentication records (SPF, DKIM, DMARC, BIMI, MTA-STS), DNS, blacklists, domain registration, and which provider hosts a mailbox. Every result is live, queried at call time, never cached. check_deliverability is the one to reach for when the question is open-ended ("is this domain any good for cold email?") since it grades SPF, DKIM, DMARC, MX, blacklists and domain age together into one A-F score.

Known tools 18

check_deliverability

Grade a domain A-F for cold email readiness.

Potential side effects

check_spf

Look up a domain's SPF record and validate it, including the recursive DNS lookup count that silently breaks SPF past 10.

Inferred read-only

check_dkim

Find and validate a domain's DKIM signing key, including key strength.

Inferred read-only

check_dmarc

Look up and parse a domain's DMARC record: policy, subdomain policy, percentage, alignment and reporting tags, each explained.

Inferred read-only

check_bimi

Validate a domain's BIMI record, the logo SVG, the VMC, and the DMARC enforcement level Gmail requires before it will show a brand logo.

Inferred read-only

check_mta_sts

Validate a domain's _mta-sts DNS record and its published policy file: mode, MX patterns, max_age and TLS-RPT.

Inferred read-only

check_dns

Query any DNS record type for a domain: MX, TXT, A, AAAA, CNAME, NS, SOA, CAA.

Inferred read-only

check_blacklist

Check a domain or IP against 20+ major email blacklists (Spamhaus, Barracuda, SORBS and others) and report which list it appears on.

Potential side effects

check_surbl

Check domains against the SURBL URI blacklist in bulk.

Inferred read-only

check_nameservers

Get the NS records and the DNS provider behind one domain or a whole list.

Inferred read-only

check_domain_expiry

Get a domain's registrar, creation date, expiry date and days remaining, over RDAP with a WHOIS fallback for ccTLDs that publish no RDAP service.

Potential side effects

check_google_domain

Tell whether a domain is already attached to a Google Workspace account, or is clear for a fresh Google tenant.

Inferred read-only

check_cname

Follow a host's full CNAME chain and flag the mistakes that break a cold-email tracking domain.

Potential side effects

verify_email

Check email addresses for syntax, live MX records, disposable providers and role prefixes (info@, sales@).

Potential side effects

segment_esp

Split a list of domains by the email provider behind them (Google, Microsoft, or a security gateway) from their MX records.

Potential side effects

plan_infrastructure

Work out how many inboxes and domains a daily cold email volume needs, and what it costs per month.

Potential side effects

expand_spintax

Expand a spintax template such as "{Hi|Hey} there" and render its Liquid merge tags, returning the total number of variations, every variable the template references, any variable with no value and no default, and a set of rendered samples.

Inferred read-only

generate_unsubscribe

Build a CAN-SPAM and GDPR compliant opt-out footer in plain text and HTML, with a checklist saying which compliance requirements the details given actually satisfy.

Inferred read-only

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.warminboxes-deliverability-tools]
url = "https://warminboxes.com/mcp"
enabled = true

Claude Code

.mcp.json

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

Claude Desktop

Settings → Connectors → Add custom connector

Name: warminboxes-deliverability-tools
Remote MCP URL: https://warminboxes.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "warminboxes-deliverability-tools": {
      "url": "https://warminboxes.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

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

Generic MCP

Client-specific MCP configuration

{
  "name": "warminboxes-deliverability-tools",
  "transport": "streamable-http",
  "url": "https://warminboxes.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

TRUST AND VERIFICATION EVIDENCE

Trust Data Available

BuiltWith Trust API v2 evidence for warminboxes.com was fetched 2026-10-03T15:02:31.870Z.

Trust status Trusted

warminboxes.com is assessed as Trusted: Domain has an established technology history spanning over a year.

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.