Email newsletter system with SendGrid, Google Sheets & freemium rate limiting

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

A complete email campaign automation system featuring dual mode access control (Demo/Pro), usage tracking, and professional email delivery. Perfect for SaaS products, marketing agencies, or anyone ...

Best for

Social Media automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.code, n8n-nodes-base.googlesheets, n8n-nodes-base.sendgrid, n8n-nodes-base.webhook, n8n-nodes-base.if, n8n-nodes-base.respondtowebhook, n8n-nodes-base.telegram

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Email newsletter system with SendGrid, Google Sheets & freemium rate limiting
Workflow name: Email newsletter system with SendGrid, Google Sheets & freemium rate limiting

A complete email campaign automation system featuring dual-mode access control (Demo/Pro), usage tracking, and professional email delivery. Perfect for SaaS products, marketing agencies, or anyone building newsletter tools with freemium models.

WHAT IT DOES This workflow manages email newsletter campaigns with built-in rate limiting for free users and unlimited access for premium users. It automatically tracks daily usage, manages user data in Google Sheets, delivers emails via SendGrid, and sends real-time notifications through Telegram.

KEY FEATURES

Dual-Mode System: Demo mode (5 emails/day) and Pro mode (unlimited)
Smart Rate Limiting: Automatic daily counter reset
User Management: Automatic new user registration and tracking
Google Sheets Integration: Stores user data, send counts, and usage history
Professional Email Delivery: SendGrid integration for reliable sending
Real-Time Monitoring: Telegram notifications for every send
Ready-to-Use Templates: 4 professional email designs included (Modern, Professional, Promotional, Newsletter)
Live Preview: See exactly how emails look before sending
HTML Export: Copy email HTML for use in any platform

HOW IT WORKS

User accesses the Email Newsletter Builder web form
Designs email using one of 4 professional templates
Chooses Demo or Pro mode
Webhook receives the email data and configuration
Workflow checks mode (Demo/Pro)
For Demo mode:
- Queries Google Sheets for user email
- Checks if user exists and validates daily limit (<5 sends)
- If new user: Creates database entry
- If existing user + under limit: Increments counter
- If limit reached: Returns error message
For Pro mode: Sends immediately without limits
SendGrid delivers the email
Google Sheets updates with new send count and timestamp
Telegram notification sent to admin
Success/error response returned to user

SETUP REQUIREMENTS

Google Sheets account (free)
SendGrid account (free tier: 100 emails/day)
Telegram account + bot (free)
n8n instance (self-hosted or cloud)

SUPPORT & FEEDBACK Questions or issues? Connect with me on LinkedIn Want to see it in action? Try the live demo: Click here

⭐ If you find this workflow helpful, please give it a rating and share your feedback!

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 - Sticky Note

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

Block 2 - Sticky Note1

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

Block 3 - Sticky Note2

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

Block 4 - Sticky Note3

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

Block 5 - Check Limit Logic

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

Block 6 - Google Sheets Read

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.5

Block 7 - Send Email (Pro)

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

Block 8 - Webhook1

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

Block 9 - Check Mode1

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

Block 10 - Check User Exists1

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

Block 11 - Create New User1

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 12 - Can Send?1

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

Block 13 - Update User Count1

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4

Block 14 - Send Email (Demo)1

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

Block 15 - Success Response (Demo)1

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

Block 16 - Limit Reached Response1

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

Block 17 - Success Response (Pro)1

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

Block 18 - Telegram Notification1

Type / Role: n8n-nodes-base.telegram - telegram
Config choices: Version 1.2

Block 19 - Check User Exists2

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

3. Summary Table

Workflow	Email newsletter system with SendGrid, Google Sheets & freemium rate limiting
Complexity	advanced
Nodes	19
Categories	Social Media
Author	Gilbert Onyebuchi
Published	13 Dec 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/11759/11759.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 Social Media workflows

Frequently asked questions

What does Email newsletter system with SendGrid, Google Sheets & freemium rate limiting 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 Social Media use case.

Gilbert Onyebuchi

12 workflows

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.code n8n-nodes-base.googlesheets n8n-nodes-base.sendgrid n8n-nodes-base.webhook n8n-nodes-base.if n8n-nodes-base.respondtowebhook n8n-nodes-base.telegram

Complexity

advanced

Published 13 Dec 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/11759/11759.json

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Email newsletter system with SendGrid, Google Sheets & freemium rate limiting

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Sticky Note

Block 2 - Sticky Note1

Block 3 - Sticky Note2

Block 4 - Sticky Note3

Block 5 - Check Limit Logic

Block 6 - Google Sheets Read

Block 7 - Send Email (Pro)

Block 8 - Webhook1

Block 9 - Check Mode1

Block 10 - Check User Exists1

Block 11 - Create New User1

Block 12 - Can Send?1

Block 13 - Update User Count1

Block 14 - Send Email (Demo)1

Block 15 - Success Response (Demo)1

Block 16 - Limit Reached Response1

Block 17 - Success Response (Pro)1

Block 18 - Telegram Notification1

Block 19 - Check User Exists2

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