BounceLens Email Check for n8n

A free community node that checks email addresses inside an n8n workflow, before you save them to a CRM or send to them.

Typos: [email protected] comes back with did_you_mean: [email protected].
Dead domains: domains that don't exist, have no mail server, or say they accept no email.
Throwaway addresses: Mailinator, 10minutemail and thousands more.
Also flagged: shared inboxes (info@, sales@), free providers, and duplicates. Gmail dot and +tag copies count as the same inbox.
Mail provider: who hosts the domain's email (Google, Microsoft, Proofpoint and others).

No API key, no account, no credits. The check runs inside your own n8n.

Install

In n8n, open Settings → Community Nodes and choose Install.
Enter the package name n8n-nodes-bouncelens and confirm.
In a workflow, search the node list for BounceLens Email Check.

Version 0.1.1, built for n8n 2.x. License: MIT. Package: npm. Source: GitHub. n8n's own steps are in its community node installation guide.

Use it in a workflow

Add the node after any node that outputs items with an email address.

Setting	Default	What it does
Email	`{{ $json.email }}`	The address to check. One per item.
Put Result in Field	`emailCheck`	Field added to each item with the result. All other fields are kept.

Then route on the result with an If or Switch node:

{{ $json.emailCheck.status }} equals unconfirmed: continue (add to the CRM, send the welcome email).
{{ $json.emailCheck.did_you_mean }} is not empty: ask the person to confirm the corrected address.
{{ $json.emailCheck.flags.disposable }} is true: reject the sign-up.

All items of one run are checked together: each domain is looked up once, and duplicates are flagged across the whole run. The node can also be used as a tool by an AI Agent node.

The result

Output for a mistyped Outlook address:

{
  "input": "[email protected]",
  "email": "[email protected]",
  "status": "risky",
  "reasons": ["No MX record; mail would go to the website server", "Looks like a typo of outlook.com"],
  "flags": { "disposable": false, "role": false, "free": false, "duplicate": false, "gateway": false },
  "did_you_mean": "[email protected]",
  "provider": null,
  "mx": null
}

status	Meaning
`invalid`	Will bounce: bad format, the domain doesn't exist, has no mail server, or accepts no email.
`risky`	Throwaway domain, likely typo, no MX record, or the DNS lookup failed.
`unconfirmed`	Format and domain are fine. The mailbox itself is not checked.

An empty or missing email is not an error: it comes back as invalid.

How it works

It uses the same checks as the email list checker on this site.
The only network calls are DNS lookups over HTTPS to Cloudflare (1.1.1.1). Your n8n must be able to reach https://cloudflare-dns.com.
It never connects to the recipient's mail server, so it can't tell whether a mailbox really exists. The best result is unconfirmed.

Privacy

Addresses are checked inside your n8n and are not sent to BounceLens. Only the domain name (the part after the @) is sent to Cloudflare's public DNS, never the full address. See the Privacy Policy.

Without n8n

Email check API: the same checks as free JSON, for any other automation tool.
WordPress plugin: checks sign-up, comment and shop forms.
Email list checker: paste a list or upload a CSV in the browser.

Support

Questions or a wrong result? Email [email protected] with your n8n version. If a result looks wrong, the domain (the part after the @) is enough.

Changelog

0.1.1 (October 2026): no change to the node; release process only.
0.1.0 (October 2026): first release.