Categories › Business & Finance › Marketing, ads & analytics
Read-only sizing and pricing for cold email inboxes: how many, which provider, what it costs.
Remote server: your requests and data go to warminboxes.com. Claude Code: claude mcp add --transport http warminboxes-free-mcp-fleet-planner https://warminboxes.com/mcp/planner · Claude app: Settings → Connectors → Add custom connector.
The tools this server listed when we connected to it, in its own words.
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 sercheck_google_domain — Tell whether a domain is already attached to a Google Workspace account, or is clear for a fresh Google tenant.lookup_mx — Look up a domain's MX records with priorities and resolved IPs, and identify the mailbox provider (Google Workspace, Microsoft 365, Zoho, Fasegment_esp — Split a list of domains by the email provider behind them (Google, Microsoft, a security gateway, or another provider) from their MX recordsplan_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 provideplan_infrastructure — Estimates how many inboxes and domains a daily cold email volume needs and the monthly cost at WarmInboxes' published prices. Inputs: emailsquote_inboxes — Prices a given number of inboxes at WarmInboxes' published prices: the domains (or Azure tenants) they sit on, daily sending capacity at theget_diagnostic_playbook — Returns WarmInboxes' diagnostic playbook for a cold email problem: the questions to ask the person, the checks to run in order from cheapestgenerate_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 plan_rotation — Builds a warm rotation, WarmInboxes' method: the inboxes split into Batch 1 and Batch 2, both tagged in the sequencer and added to the campaplan_verification_waterfall — Price an email verification waterfall: the list run through verifiers in sequence with unknowns passed down the chain, every order compared,convert_csv — Rename a lead CSV's columns to the fields a sequencer imports (Instantly, Smartlead, EmailBison, or generic snake_case). Every row and columfind_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 MCPfind_resources — Search what WarmInboxes publishes: operator notes (WarmInboxes' rules from running fleets, with the research behind them), cold email guidesread_resource — Read a WarmInboxes operator note, guide, study, playbook, dataset, recipe, comparison or changelog entry in full, as markdown. Long pages coget_pricing — The WarmInboxes price list as data: prewarmed and fresh inboxes on Google Workspace, Microsoft 365 and Azure, every billing cycle, the safe Not tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.