Automate Email Validation for New HubSpot Contacts and Alert via Slack

Automatically validate the email addresses of new contacts in HubSpot using OneSimpleAPI and send alerts to Slack for suspicious emails.

n8n

This workflow streamlines the process of ensuring the integrity of your contact database by automatically validating email addresses of newly added contacts in HubSpot. It leverages OneSimpleAPI to check the deliverability, domain validity, and disposability of the email addresses. If any email is flagged as suspicious, a notification is sent to a specified Slack channel, allowing for quick action and follow-up.

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Last updated October 17, 2026
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How to import this workflow into n8n

  1. 1Purchase or download the workflow to get the n8n workflow JSON file.
  2. 2In your n8n instance, open Workflows and choose "Import from File" (or paste the JSON with Ctrl+V on the canvas).
  3. 3Open each node marked with a credential warning and connect your own accounts and API keys.
  4. 4Run the workflow once manually to verify the data flow, then toggle it to Active.

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