Draft and approve Gmail replies with OpenAI and CustomJS

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1. Workflow Overview

Quick Overview This workflow drafts replies for unread Gmail messages using OpenAI, publishes a Tailwind/Alpine approval dashboard to CustomJS, and sends approved replies back through Gmail via a w...

Best for

Ticket Management automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.manualtrigger, @custom-js/n8n-nodes-pdf-toolkit-v2.pdftoolkit, n8n-nodes-base.stickynote, n8n-nodes-base.gmail, n8n-nodes-base.webhook, n8n-nodes-base.code, @n8n/n8n-nodes-langchain.openai

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Draft and approve Gmail replies with OpenAI and CustomJS
Workflow name: Draft and approve Gmail replies with OpenAI and CustomJS

Quick Overview

This workflow drafts replies for unread Gmail messages using OpenAI, publishes a Tailwind/Alpine approval dashboard to CustomJS, and sends approved replies back through Gmail via a webhook submission.

How it works

Starts manually and pulls unread emails from Gmail (up to the configured limit).
Filters out messages whose sender contains common no-reply patterns.
Sends each remaining email’s subject, snippet, sender, and recipient to OpenAI (gpt-5) to generate a draft reply.
Combines the email metadata with the generated drafts and builds a single HTML inbox-style approval page that posts approvals back to an n8n webhook.
Uploads (upserts) the generated HTML dashboard to CustomJS as a hosted page.
Receives approved/edited reply text via the webhook, replies to the original message in Gmail using the message ID, and then marks the message as read.

Setup

Add a Gmail OAuth2 credential and select it for the Gmail read, reply, and mark-as-read steps.
Add an OpenAI API credential and ensure the selected model (gpt-5) is available in your OpenAI account.
Add a CustomJS credential and set the target page name you want to upsert (for example, “Dashboard”).
In the HTML builder code, set N8N_BASE_URL to your reachable n8n URL and switch the webhook prefix from webhook-test to webhook for production.
Activate the workflow so the “email-reply-submit” webhook endpoint can receive approvals from the hosted dashboard.

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 - When clicking 'Execute workflow'

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

Block 2 - Upsert Approval Page

Type / Role: @custom-js/n8n-nodes-pdf-toolkit-v2.pdfToolkit - pdfToolkit
Config choices: Version 1

Block 3 - Sticky Note Overview

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

Block 4 - Sticky Note Email

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

Block 5 - Sticky Note AI

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

Block 6 - Sticky Note Host

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

Block 7 - Get many messages

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

Block 8 - Webhook - Receive Approval

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

Block 9 - Extract Reply Data

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 10 - Lane 2 Note

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

Block 11 - Filter No Reply Emails

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 12 - Generate AI Draft Reply

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 2.1

Block 13 - Format Email Drafts

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 14 - Build Approval Page

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 15 - Reply to a message

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

Block 16 - Mark a message as read

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

3. Summary Table

Workflow	Draft and approve Gmail replies with OpenAI and CustomJS
Complexity	advanced
Nodes	16
Categories	Ticket Management, AI Chatbot
Author	CustomJS
Published	30 May 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/16027/16027.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 Ticket Management workflows AI Chatbot workflows

Frequently asked questions

What does Draft and approve Gmail replies with OpenAI and CustomJS 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 Ticket Management, AI Chatbot use case.

CustomJS

22 workflows

Nodes

n8n-nodes-base.manualtrigger @custom-js/n8n-nodes-pdf-toolkit-v2.pdftoolkit n8n-nodes-base.stickynote n8n-nodes-base.gmail n8n-nodes-base.webhook n8n-nodes-base.code @n8n/n8n-nodes-langchain.openai

Complexity

advanced

Published 30 May 2026

Likes 0

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Install path: /data/workflows/16027/16027.json

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Draft and approve Gmail replies with OpenAI and CustomJS

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Quick Overview

How it works

Setup

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - When clicking 'Execute workflow'

Block 2 - Upsert Approval Page

Block 3 - Sticky Note Overview

Block 4 - Sticky Note Email

Block 5 - Sticky Note AI

Block 6 - Sticky Note Host

Block 7 - Get many messages

Block 8 - Webhook - Receive Approval

Block 9 - Extract Reply Data

Block 10 - Lane 2 Note

Block 11 - Filter No Reply Emails

Block 12 - Generate AI Draft Reply

Block 13 - Format Email Drafts

Block 14 - Build Approval Page

Block 15 - Reply to a message

Block 16 - Mark a message as read

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