# AI Lead Validator: Verify Emails with MCP and HubSpot: n8n workflow

> Started by another system calling it, and works across HubSpot and Slack. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/ai-lead-validator-verify-emails-with-mcp-and-hubspot (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Lead generation](https://millionrounds.com/workflows?category=Lead+generation#library)

# AI Lead Validator: Verify Emails with MCP and HubSpot

Started by another system calling it, and works across HubSpot and Slack. It hands the judgement calls to OpenAI. 12 steps, 2 branches: a working afternoon to understand properly.

Medium Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fai-lead-validator-verify-emails-with-mcp-and-hubspot)

**12 steps** Medium: a working afternoon

**2** Branches: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 2 Model 3 Logic 3 Service 4

The steps in the order they run, from what starts it.

- 1 **Form Submission Webhook** Webhook *Starts it*
- 2 **GPT-4o-mini** Lm Chat Open Ai *Model*
- 3 **Email Checker MCP** Mcp Client Tool *Model*
- 4 **Lead Quality Agent** Agent *Model*
- 5 **Parse Lead Decision** Code *Logic*
- 6 **Is Valid Lead?** If *Logic*
- 7 **Respond to Form** Respond To Webhook *Starts it*
- 8 **HubSpot, Add Verified Lead** Hubspot *Service*
- 9 **Is Risky Lead?** If *Logic*
- 10 **HubSpot, Add Risky Lead** Hubspot *Service*
- 11 **Slack, Blocked Lead Alert** Slack *Service*
- 12 **Slack, Risky Lead Alert** Slack *Service*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 12, with 2 branches
- **Size:** Medium: a working afternoon
- **Connects to:** HubSpot, Slack
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own HubSpot and Slack accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 12 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 12 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fai-lead-validator-verify-emails-with-mcp-and-hubspot)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[HubSpot](https://millionrounds.com/workflows?service=HubSpot#library)[Slack](https://millionrounds.com/workflows?service=Slack#library)

## Workflows like it

Also lead generation, with the same services where possible, closest in size first.

- [**AI-Powered Lead Qualification & Routing with OpenAI and Slack** 12 steps · calls a model · Airtable, Email](https://millionrounds.com/workflow/ai-powered-lead-qualification-and-routing-with-openai-and-sl)
- [**Monitor Reddit brand mentions and send lead alerts with Apify** 12 steps · calls a model · Apify, Discord](https://millionrounds.com/workflow/monitor-reddit-brand-mentions-and-send-lead-alerts-with-apif)
- [**Process social media leads with OpenAI and Google Sheets** 12 steps · calls a model · Google Sheets, Jira](https://millionrounds.com/workflow/process-social-media-leads-with-openai-and-google-sheets)
- [**Qualify LinkedIn post engagers into scored leads with Apify** 12 steps · calls a model · Google Sheets, Slack](https://millionrounds.com/workflow/qualify-linkedin-post-engagers-into-scored-leads-with-apify)
- [**Qualify WhatsApp insurance leads with OpenAI and HubSpot** 12 steps · calls a model · HubSpot, Slack](https://millionrounds.com/workflow/qualify-whatsapp-insurance-leads-with-openai-and-hubspot)
- [**Qualify real estate leads with OpenAI and Slack** 12 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/qualify-real-estate-leads-with-openai-and-slack)