Classify Gmail Emails with GPT-4o mini and Send Telegram Notifications

Gmail AI Email Classifier & Notifier

Since Gmail inboxes can quickly become cluttered, this workflow provides an automated AI-based email classification system. It listens for new emails, categorizes them using an AI classifier, applies Gmail labels, and sends you a Telegram notification with a quick summary.

If you often miss urgent client messages or struggle with sorting work vs. promotions, this workflow ensures you never overlook important emails.

Use case: Especially useful for professionals who receive a high volume of mixed emails (clients, work, promotions). The workflow automatically labels and notifies you of new emails based on their category.

How It Works

Trigger Input

The workflow starts with the Gmail Trigger node, which listens for new incoming emails. By default, it polls every minute, but you can adjust the polling frequency. Email metadata (from, subject, body) is passed downstream.

Example JSON input:

  {
 "from": "client@example.com",
 "subject": "Urgent project deadline",
 "text": "Please review the attached contract ASAP"

}

Classify Email (AI)

The Classification Agent (powered by OpenAI via LangChain) receives the email data. It sorts the email into one of four categories:

 High Priority – urgent, time-sensitive
 Work Related – general work emails
 Promotions – newsletters, offers, sales
 Other – uncategorized emails

The classifier uses a system prompt to ensure output is returned in JSON format for downstream processing.

Apply Gmail Labels

Based on classification, the workflow applies the corresponding Gmail label:

 High Priority → “Important + Starred”
 Work Related → “Work” (custom Gmail label)
 Promotions → “Promotions” (custom Gmail label)

Each label must already exist in Gmail for the operation to work.

Generate Notification

The AI Agent (notification assistant) takes the classified email and rewrites it into a short, casual notification. Example notification:

      [High Priority] New email from client@example.com  
 Subject: Urgent project deadline  
 "Please review the attached contract ASAP"
 

Send to Telegram

The Telegram node sends the generated notification to your personal chat ID. Requires a Telegram bot created with @BotFather and your chat ID configured.

How to Use

Import this workflow into n8n. Set up Gmail OAuth2 credentials and connect your Gmail account. Create Gmail labels: High Priority, Work Related, Promotions. Set up a Telegram bot in @BotFather and copy your chatId into the node. Run the workflow — every new email will now be classified, labeled, and notified.

Requirements

n8n Gmail Trigger** with Gmail OAuth2 credentials OpenAI API key** configured for LangChain nodes Telegram bot** created via @BotFather with your chat ID Existing Gmail labels (Work, Promotions, etc.)

Customizing This Workflow

You can extend it by:

Adding more categories** – e.g., “Finance,” “Personal,” or “Spam.” Changing the notification channel** – send to Slack, Discord, or SMS instead of Telegram. Adjusting classification rules** – edit the system prompt for finer-grained AI sorting. Changing polling frequency** – set Gmail Trigger to every 5 minutes instead of every minute. Expanding extracted fields** – include attachments, links, or CC addresses in the notification.