Name: WarmInboxes Free Deliverability Tools
Author: com.warminboxes

Tools observed via MCP handshake

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, or a security gateway) from their MX records. Sending Google-to-Google and Microso
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 Google / Microsoft / other
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
analyze_email_html — Read an email's HTML. Returns its size against Gmail's ~102 KB clipping limit with what is taking the room, every link and image host, tracking pixels, URL shor
analyze_dmarc_report — Read DMARC aggregate (rua) reports and say who is sending as the domain and what fails: messages passing and failing, failures that are alignment only, quaranti
analyze_cold_email — Score a cold email's copy 0-100 for spam risk before it is sent: weighted trigger words by category and severity (subject hits weigh extra), ALL-CAPS, links and
audit_campaign — Audit a cold email campaign before launch: the lead CSV and the sequence checked together for merge tags with no column or empty values, variable syntax the seq
analyze_bounces — Classify bounce messages (NDRs): invalid address, full or disabled mailbox, reputation block, authentication failure, throttling, content block or configuration
analyze_microsoft_headers — Read the spam verdict Microsoft 365 or Outlook stamped on a delivered message: SCL (spam confidence), BCL (bulk), PCL, SFV, the category, and the SPF, DKIM, DMA
preview_inbox — Show how a cold email's sender name, subject line and preview text are cut off in Gmail desktop, Gmail mobile and Outlook, with warnings (no sender name, all ca
generate_dns_records — Write an SPF record from the providers that send for a domain (with an estimate of its DNS lookups against the limit of 10), a DMARC record from a policy, and w
plan_rotation — Suggests a two-batch inbox rotation schedule: the fleet split in half, one batch sending while the other rests, swapped every 1, 2 or 4 weeks. Returns batch siz
plan_verification_waterfall — Price an email verification waterfall: the list run through verifiers in sequence with unknowns passed down the chain, every order compared, cheapest cost per u
clean_csv — Clean a lead CSV: malformed, duplicate, role-based (info@, sales@) and disposable addresses removed, with a count for each reason. Returns the cleaned CSV when
convert_csv — Rename a lead CSV's columns to the fields a sequencer imports (Instantly, Smartlead, EmailBison, or generic snake_case). Every row and column is kept; only the
combine_csvs — Merge several lead CSVs into one, matching columns that mean the same thing (Email, email_address, E-mail), optionally removing duplicate emails and adding a co
check_suppression — Check a campaign list against a do-not-contact list before sending: exact email matches and, optionally, whole suppressed domains, with a per-company cap. Retur
spamhaus_dbl_guidance — Explains how to check a domain on the Spamhaus Domain Block List by hand at https://check.spamhaus.org. Does not query the Spamhaus DBL (it needs a paid key) an
burned_inbox_guidance — Directs the person to the external Burned Inbox Checker at https://burnedinbox.com. Does not itself determine whether an inbox or domain is burned; the result g
cold_email_writing_resources — Directs the person to Cold Email AI, the WarmInboxes cold email writing assistant at https://warminboxes.com/AI (a custom GPT on ChatGPT). Does not generate ema
find_lead_lists — Searches WarmInboxes' own catalogue of about 1,000 free B2B lead lists, by industry, role and country, as published at https://warminboxes.com/leads. It does no
find_tools — Find the WarmInboxes free tool for a task ("check my email headers", "clean a CSV", "will this land in spam") and say how to use it: the MCP tool to call here,
find_resources — Search what WarmInboxes publishes: cold email guides, deliverability playbooks, original studies and their datasets, costed infrastructure recipes, tool demo vi
read_resource — Read a WarmInboxes guide, study, playbook, dataset, recipe, comparison or changelog entry in full, as markdown. Long pages come in parts split at headings: the
get_pricing — The WarmInboxes price list as data: prewarmed and fresh inboxes on Google Workspace, Microsoft 365 and Azure, every billing cycle, the safe daily send pace per

when	check	result	http	latency	detail
3 h ago	mcp initialize	ok	200	327 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 52 tools
10 h ago	mcp initialize	ok	200	509 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 52 tools
18 h ago	mcp initialize	ok	200	575 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 52 tools
25 h ago	mcp initialize	ok	200	537 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 52 tools
32 h ago	mcp initialize	ok	200	333 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 52 tools
2 d ago	mcp initialize	ok	200	380 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 52 tools
2 d ago	mcp initialize	ok	200	480 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 51 tools
2 d ago	mcp initialize	ok	200	346 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 51 tools
3 d ago	mcp initialize	ok	200	435 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 51 tools
3 d ago	mcp initialize	ok	200	579 ms	server warminboxes-deliverability-tools 1.0.0 · protocol 2025-06-18 · 51 tools

WarmInboxes Free Deliverability Tools

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