com.warminboxes/deliverability-tools

up checked 2026-11-11T09:39:58.820Z

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Publisher-provided title

WarmInboxes Free MCP

Publisher-provided description

Read-only deliverability + strategy: free cold email checks, list tools, inbox planning, research.

Summary by lookupd

Read-only checks for cold email deliverability: SPF, DKIM, DMARC, blacklists, MX and sending-fleet planning.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http deliverability-tools https://warminboxes.com/mcp

Codex, remote (streamable-http)

codex mcp add deliverability-tools --url https://warminboxes.com/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

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

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (showing 30 of 52)

Publisher-provided text

• check_deliverability Grade a domain A-F for cold email readiness. Checks SPF, DKIM, DMARC, MX, blacklists and domain age together and returns a weighted score with a per-check break
• check_spf Look up a domain's SPF record and validate it, including the recursive DNS lookup count that silently breaks SPF past 10.
• check_dkim Find and validate a domain's DKIM signing key, including key strength. Leave selector empty to auto-scan 26 common selectors (google, selector1, k1, and the res
• check_dmarc Look up and parse a domain's DMARC record: policy, subdomain policy, percentage, alignment and reporting tags, each explained. p=none (monitoring) passes: it me
• 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.
• check_mta_sts Validate a domain's _mta-sts DNS record and its published policy file: mode, MX patterns, max_age and TLS-RPT.
• check_ssl Read a host's TLS certificate: issuer, validity dates and days remaining, subject alternative names, key type and size, signature algorithm, chain, negotiated p
• check_dns Query any DNS record type for a domain: MX, TXT, A, AAAA, CNAME, NS, SOA, CAA.
• lookup_txt Every TXT record on a domain, with each one identified (SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, or which service's ownership token it is), plus the four under
• check_rdns The PTR record for an IPv4 or IPv6 address, and the forward lookup that decides whether it counts. Reverse DNS is delegated to whoever holds the address block,
• check_blacklist Check a domain or IP against 20+ major email blacklists (Spamhaus, Barracuda, SORBS and others) and report which list it appears on.
• check_surbl Check domains against the SURBL URI blacklist in bulk. URI blacklists list the domains that appear inside a message body, so a listed tracking or landing domain
• check_nameservers Get the NS records and the DNS provider behind one domain or a whole list. Useful for working out who actually controls a domain's DNS before trying to fix its
• 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. Domain age is
• check_google_domain Tell whether a domain is already attached to a Google Workspace account, or is clear for a fresh Google tenant.
• check_cname Follow a host's full CNAME chain and flag the mistakes that break a cold-email tracking domain. Pass expected to assert where the chain should end up.
• verify_email Check email addresses for syntax, live MX records, disposable providers and role prefixes (info@, sales@). Does not open SMTP connections, so catch-all domains
• lookup_mx Look up a domain's MX records with priorities and resolved IPs, and identify the mailbox provider (Google Workspace, Microsoft 365, Zoho, Fastmail and others) a
• segment_esp Split a list of domains by the email provider behind them (Google, Microsoft, a security gateway, or another provider) from their MX records. WarmInboxes routes
• plan_from_list Estimates a sending fleet for a recipient list. Looks up the MX records of up to 100 recipient domains (or addresses) to measure the provider mix, then sizes a
• plan_infrastructure Estimates how many inboxes and domains a daily cold email volume needs and the monthly cost at WarmInboxes' published prices. Inputs: emailsPerDay; optionally t
• quote_inboxes Prices a given number of inboxes at WarmInboxes' published prices: the domains (or Azure tenants) they sit on, daily sending capacity at the provider's pace, mo
• get_diagnostic_playbook Returns WarmInboxes' diagnostic playbook for a cold email problem: the questions to ask the person, the checks to run in order from cheapest to most expensive (
• 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 refer
• 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 sati
• check_email_authentication SPF, DKIM, DMARC, MX, BIMI and MTA-STS for one domain in one call, each judged pass, weak, fail or not set, with the essentials separated from the optional reco
• check_domain_reputation For "this domain used to land and now it does not". Checks the domain against SURBL, its authentication, its age and the address its website resolves to, and re
• check_tracking_domain Check the domain a campaign's tracked links point at: whether it resolves, serves a valid certificate, is listed on SURBL, sits on a listed address, belongs und
• check_bulk_sender_requirements The bulk sender requirements, sorted honestly: SPF, DKIM, DMARC and MX checked from DNS; forward and reverse DNS when given the sending IP; one-click unsubscrib
• analyze_headers Read a received message's raw headers. Returns the SPF, DKIM and DMARC verdicts the receiver recorded, which domains authenticated and whether they align with t

Details

• Version: 1.3.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 702 ms
• First indexed: 2026-11-01T09:00:01.101Z
• Last seen in registry: 2026-11-10T22:17:19.449Z
• Website: https://warminboxes.com/for-ai

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