Emailable provides email verification for marketers and developers: bulk list cleaning and an API that checks whether addresses are likely deliverable.
isBusinessEmail answers the B2B question instead: is this signup from a company domain, and does that company run Google Workspace or Microsoft 365?
Quick comparison of jobs
| Job | Better fit |
|---|---|
| Clean a list before sending | Emailable or another verifier |
| Reduce bounces | Emailable or another verifier |
| Require work emails at signup | isBusinessEmail |
| Allow / review / block decision with reasons | isBusinessEmail |
| Microsoft tenant ID and federation, Google Workspace detection | isBusinessEmail |
For Emailable’s current features and pricing, check their site.
How isBusinessEmail decides
- Normalize the address (lowercase, punycode, strip
+tags, find the registrable domain), and flag role accounts, typos and lookalikes. - Match lists: shared providers, disposable, relay, education, government, blocklists, reviewed overrides.
- Read DNS: MX fingerprints, SPF, DMARC, DKIM and SaaS verification tokens.
- Detect the suite: Google Workspace, Microsoft 365 (tenant ID via Microsoft’s public discovery), others.
- Decide with your policy, and return the reasons.
There’s no step that contacts the user’s mailbox. That’s deliberate: see what we don’t do.
Free, with fair use
isBusinessEmail is free for everyone. New accounts get 100 checks a day, rising automatically after a week of clean use. Details: Rate limits.