Smart Email Auto-Responder Template using AI

Smart Email Auto-Responder with AI Classification
Automatically Categorize and Reply to Emails using LangChain + Google Gemini + Gmail + SMTP + Brevo

This n8n workflow is designed to intelligently manage incoming emails and automatically send personalized responses based on the content. It classifies emails using LangChain's Text Classifier, sends HTML responses depending on the category, and updates Gmail and Brevo CRM accordingly.

Key Features

Triggers and Classifies Emails
Listens for new Gmail messages every hour
Uses AI-based classification to identify the type of inquiry For Example:
Guest Post
YouTube Review
Udemy Course Inquiry

Responds Automatically
Sends professional HTML replies customized for each type
Uses SMTP to deliver emails from your domain

Enhances Workflow with Automation
Marks processed emails as read
Applies Gmail labels
Adds sender to Brevo contact list

Optional AI Chat Integration
Uses Google Gemini (PaLM 2) to enhance classification or summarization

Tools & Integrations Required

Gmail account (OAuth2) LangChain (Text Classifier node) Google Gemini API account SMTP credentials (e.g., Gmail SMTP, Brevo, etc.) Brevo/Sendinblue account and API key

Step-by-Step Node Guide

1. Gmail Trigger
   Polls Gmail every hour for new emails.
   Filters out internal addresses (e.g., @syncbricks.com).
   Avoids replying to already-responded emails (Re: subject filter).

2. LangChain Text Classifier
   Uses AI to categorize the content of the email based on pre-defined categories:
   Guest Post**
   Youtube**
   Udemy Courses**

3. Google Gemini (PaLM) Chat Model (Optional)
   Provides additional AI support to enhance classification accuracy.
   Can be used to summarize or enrich the context if needed.

4. Email Send Nodes
   Each response category has a separate SMTP node with a custom HTML email: Guest Post Inquiry**
   YouTube Video Inquiry**
   Udemy Course Inquiry**

5. Gmail: Mark as Read
   Marks the email so it isn’t processed again.

6. Gmail: Apply Label
   Adds a label (e.g., Handled by Bot) for organization.

7. Brevo: Create/Update Contact
   Saves the sender to your CRM for future communication or marketing.

Email Templates Included

Guest Post Template
Includes pricing, website list, submission guidelines, and payment instructions.

YouTube Review Template
Includes package pricing, review samples, video thumbnails, and inquiry instructions.
Step by Step Tutorial

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How to Use

Import the template into your n8n instance. Configure your Gmail OAuth2 and SMTP credentials. Set up your LangChain Text Classifier and Google Gemini API credentials. Update label ID in the Gmail node and ensure all custom fields like from.value[0].name match your use case. Run the workflow and watch it respond intelligently to new inquiries.

Best Practices

Always test with mock emails first. Keep the Google Gemini node optional if you want to reduce cost/API calls. Use Gmail filters to auto-label certain types of emails. Monitor your Brevo contacts to track new leads.

Attribution & Support

Developed by Amjid Ali
This template took extensive time and effort to build. If you find it useful, please consider supporting my work.

Buy My Book:
Mastering n8n on Amazon

Full Courses & Tutorials:
http://lms.syncbricks.com

Follow Me Online:
LinkedIn: https://linkedin.com/in/amjidali
Website: https://amjidali.com
YouTube: https://youtube.com/@syncbricks