isBusinessEmail icon
isBusinessEmail icon

isBusinessEmail

Free API that tells real work emails from personal, disposable, relay and shared team inboxes, and shows if the company runs Google Workspace or Microsoft 365.

isBusinessEmail screenshot 1

Cost / License

  • Free
  • Proprietary

Platforms

  • Online
isBusinessEmail screenshot 1
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Features

  1.  Email api
  2.  Email automation
  3.  Email validation

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isBusinessEmail information

isBusinessEmail was added to AlternativeTo by Sarunas Strasevicius on and this page was last updated .

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What is isBusinessEmail?

isBusinessEmail is a free API that answers two questions about every signup: is this a real person's work email, and what does the company run?

Send an address or domain and get a verdict (business, personal, disposable, relay, education or government), a confidence score, an allow / review / block recommendation and the reason codes behind it. It spots team, shared and group inboxes like sales@ or support@, fixes typos and flags lookalike domains.

It also detects Google Workspace, even behind Proofpoint or Mimecast, and Microsoft 365 with the tenant ID, region and whether sign-in runs through Okta, ADFS or Ping. B2B products use it to ask for the work email up front, pre-select the right connector and route leads.

It never probes mailboxes, never stores full addresses and runs on an EU database. Batch checks, browser keys, integration guides for Clerk, Auth0, Supabase, n8n, Zapier and more, an MCP server for AI agents, free web tools (Microsoft tenant lookup, Google Workspace checker, MX and SPF/DMARC lookup) and daily open domain lists.

Free: 100 checks a day, rising to 10,000 a day after a week. No credit card.