Check business emails in n8n

n8n’s HTTP Request node is all you need: one call per item, then route on recommendation or category. Works on n8n Cloud and self-hosted.

1. Create a credential

Credentials → New → Header Auth

Field	Value
Name	Authorization
Value	Bearer ibe_live_…

2. Add an HTTP Request node

Setting	Value
Method	POST
URL	https://api.isbusinessemail.com/v1/check
Authentication	Generic Credential Type → Header Auth → the credential above
Send Body	On, Body Content Type JSON
Specify Body	Using JSON
JSON (switch the field to Expression)	{ "email": "{{ $json.email }}" }
Options → Timeout	3000

Adjust $json.email to wherever the address is in your incoming data (a form trigger, a webhook, a CRM node).

The node outputs the full response: category, recommendation, reasons, workspace…

3. Route the result

Add a Switch node with rules on {{ $json.recommendation }}:

Output	Rule	Typical next step
allow	equals allow	Create the CRM contact, notify sales
review	equals review	Add to a review list or Slack channel
block	equals block	Drop, or send a “please use your work email” reply

Want Microsoft 365 companies routed to a specific rep? Add an IF node on {{ $json.workspace.microsoft_365.detected }}.

4. Don’t let errors stop the workflow

In the HTTP Request node’s Settings:

• Retry On Fail: on, 2 tries, wait 1000 ms (handles 429 and brief network issues).
• On Error: Continue (using error output), and route the error output to your “allow” branch, so leads aren’t lost if the call fails.

Many items at once

The HTTP Request node runs once per item, and each call counts toward your daily quota (100 a day on a new account). For large imports, either:

• add Loop Over Items with a small batch size and a Wait node to stay within per-second limits, or
• aggregate up to 100 addresses and call POST /v1/check/batch with { "items": [...] }, then split results back into items.

Test it

Use workspace@test.isbusinessemail.com, personal@test.isbusinessemail.com and disposable@test.isbusinessemail.com. They return fixed results and don’t count (full list).

Official docs: n8n documentation (HTTP Request node). See also: B2B lead qualification.