Send GPT-4o follow-up emails to leads and detect replies with Gmail

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1. Workflow Overview

Who It's For Sales teams, agencies, and service businesses that follow up with inbound leads via email and want to automate the entire sequence without losing the personal touch. How It Works 1. We...

Best for

Lead Nurturing automation workflows
Multimodal AI automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.set, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.lmchatopenai, n8n-nodes-base.gmail, n8n-nodes-base.wait, n8n-nodes-base.slack, n8n-nodes-base.googlesheets

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Andrew.

Original n8n.io source

1.1 Workflow description

Title: Send GPT-4o follow-up emails to leads and detect replies with Gmail
Workflow name: Send GPT-4o follow-up emails to leads and detect replies with Gmail

Who It's For

Sales teams, agencies, and service businesses that follow up with inbound leads via email and want to automate the entire sequence without losing the personal touch.

How It Works

Webhook receives the new lead form submission
Configure Variables node sets your sender name, email, company name, reply detection email, and wait time in one place
OpenAI writes a personalized first follow-up email based on the lead's inquiry details
Gmail sends the first email
Wait node holds the workflow for 48 hours
Gmail searches the inbox for any reply from the lead
If the lead replied: Slack notifies your team and Google Sheets logs the reply status, name, email, and timestamp
If no reply: OpenAI writes a second follow-up from a different angle and Gmail sends it

Set Up Steps

Update the Configure Variables node with your sender name, email, company name, and reply detection email
Connect your Gmail, OpenAI, Slack, and Google Sheets credentials to each node
Create a Google Sheet with columns: Lead Name, Email, Reply Status, Date
Activate the workflow and test with a webhook POST request

Requirements

Gmail account with OAuth credential
OpenAI API key
Slack workspace with a notifications channel
Google Sheet set up for reply logging

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - New Lead Form Submission

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2.1

Block 2 - Configure Variables

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 3 - Generate First Follow-Up Email

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 4 - OpenAI Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.3

Block 5 - Send First Follow-Up Email

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.2

Block 6 - Wait 48 Hours

Type / Role: n8n-nodes-base.wait - wait
Config choices: Version 1.1

Block 7 - Notify Team of Reply

Type / Role: n8n-nodes-base.slack - slack
Config choices: Version 2.4

Block 8 - Log Reply Status to Sheet

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 9 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 10 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 12 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 13 - Send Second Follow-Up Email

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.2

Block 14 - Generate Second Follow-Up Email

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 15 - Did Lead Reply?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 16 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Sticky Note5

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Sticky Note6

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Check for Lead Reply

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.2

3. Summary Table

Workflow	Send GPT-4o follow-up emails to leads and detect replies with Gmail
Complexity	advanced
Nodes	19
Categories	Lead Nurturing, Multimodal AI
Author	Andrew
Published	14 May 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15725/15725.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Lead Nurturing workflows Multimodal AI workflows

Frequently asked questions

What does Send GPT-4o follow-up emails to leads and detect replies with Gmail do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Lead Nurturing, Multimodal AI use case.

Andrew

3 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.set @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.lmchatopenai n8n-nodes-base.gmail n8n-nodes-base.wait n8n-nodes-base.slack n8n-nodes-base.googlesheets

Complexity

advanced

Published 14 May 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/15725/15725.json

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Send GPT-4o follow-up emails to leads and detect replies with Gmail

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who It's For

How It Works

Set Up Steps

Requirements

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - New Lead Form Submission

Block 2 - Configure Variables

Block 3 - Generate First Follow-Up Email

Block 4 - OpenAI Model

Block 5 - Send First Follow-Up Email

Block 6 - Wait 48 Hours

Block 7 - Notify Team of Reply

Block 8 - Log Reply Status to Sheet

Block 9 - Sticky Note

Block 10 - Sticky Note1

Block 11 - Sticky Note2

Block 12 - Sticky Note3

Block 13 - Send Second Follow-Up Email

Block 14 - Generate Second Follow-Up Email

Block 15 - Did Lead Reply?

Block 16 - Sticky Note4

Block 17 - Sticky Note5

Block 18 - Sticky Note6

Block 19 - Check for Lead Reply

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions