Let AI agents check whether an email is a real person's work address or a personal, disposable, relay or shared team inbox (info@, sales@, support@), and see which stack the company runs: Google Workspace or Microsoft 365 with tenant ID and identity provider. Every verdict comes with reason codes and an allow / review / block recommendation. Docs: https://isbusinessemail.com/docs/mcp
Scored across 6 tools
The core intent tools are mostly distinct: check_email classifies business vs personal, verify_email tests SMTP deliverability, and check_domain targets domains rather than addresses. check_email and verify_email both operate on an email and could be momentarily confused, and check_batch overlaps with the single-item tools, but the descriptions clearly separate their purposes (speed vs accuracy, single vs list).
All six names follow a consistent snake_case verb_noun pattern (check_batch, check_domain, check_email, get_usage, report_wrong_verdict, verify_email). The verb prefixes (check/get/report/verify) are chosen to match distinct operations rather than randomly mixed, so the surface reads predictably.
Six tools is well-scoped for an email verification/classification service, with no redundant entries. Each tool covers a distinct facet (single check, batch, domain, deliverability, usage, feedback).
The surface covers the full lifecycle of an email-validation domain: single and batch classification, domain-level inspection, SMTP deliverability verification, quota/usage introspection, and a correction/feedback channel. No obvious gaps or dead ends for a business-email classifier.
Check up to 100 email addresses and/or domains in one call, for lists, CRM exports and lead qualification. Results come back in input order. Each item counts as one check.
Inputs: items (required), policy.
Classify a domain (e.g. acme.io): company domain or shared/free provider, disposable, relay, education or government; its mail provider and MX records; and whether it runs Google Workspace or Microsoft 365.
Inputs: domain (required), policy.
Is this a work email or a personal one? Returns category (business, personal, disposable, relay, education, government, invalid, unknown), is_business, an allow/review/block recommendation, reasons, typo suggestion, mail provider and Google Workspace / Microsoft 365 detection.
Inputs: email (required), policy.
The account's tier, rate limits, checks used and remaining in the current quota period (a day on the free tier, a month on paid plans), and the last 30 days of usage.
Inputs: no named parameters.
Tell isBusinessEmail that an address or domain was classified wrongly. A person reviews every report before any list changes.
Inputs: input (required), expected_category (required), comment.
Does this exact email address accept mail? Asks the domain's mail server over SMTP (no email is sent) and tests for catch-all. Returns status deliverable, undeliverable, risky (catch-all, full mailbox, disposable) or unknown (greylisted, probe refused), a reason, confidence, and the category. Slower than check_email (up to ~30 s); use it before sending, not for every sign-up.
Inputs: email (required).
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