Sync Gmail emails to PostgreSQL with S3 attachment storage

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Important notice

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

1. Workflow Overview

Sync Gmail emails to PostgreSQL with S3 attachment storage Automated Gmail Email Processing System Who's it for Businesses and individuals who need to: Archive email communications in a searchable ...

Best for

Document Extraction automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.splitinbatches, n8n-nodes-base.code, n8n-nodes-base.set, n8n-nodes-base.merge, n8n-nodes-base.aggregate, n8n-nodes-base.postgres, n8n-nodes-base.filter

Source and attribution

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

Original n8n.io source

1.1 Workflow description

Title: Sync Gmail emails to PostgreSQL with S3 attachment storage
Workflow name: Sync Gmail emails to PostgreSQL with S3 attachment storage

Sync Gmail emails to PostgreSQL with S3 attachment storage

Automated Gmail Email Processing System

Who's it for

Businesses and individuals who need to:

Archive email communications in a searchable database
Backup email attachments to cloud storage
Analyze email patterns and communication data
Comply with data retention policies
Integrate emails with other business systems

What it does

This workflow automatically captures, processes, and stores Gmail emails in a PostgreSQL database while uploading file attachments to S3/MinIO storage. It handles both individual emails (via Gmail Trigger) and bulk processing (via Schedule Trigger).

Key features:

Dual processing: real-time individual emails + scheduled bulk retrieval
Complete email metadata extraction (sender, recipients, labels, timestamps)
HTML to plain text conversion for searchable content
Binary attachment processing with metadata extraction
Organized S3/MinIO file storage structure
UPSERT database operations to prevent duplicates

How it works

Email Capture: Gmail Trigger detects new emails, Schedule Trigger gets bulk emails from last hour
Parallel Processing: Emails with attachments go through binary processing, others go directly to transformation
Attachment Handling: Extract metadata, upload to S3/MinIO, create database references
Data Transformation: Convert Gmail API format to PostgreSQL structure
Storage: UPSERT emails to database with linked attachment information

Requirements

Credentials needed:

Gmail OAuth2 (gmail.readonly scope)
PostgreSQL database connection
S3/MinIO storage credentials

Database setup: Run the provided SQL schema to create the messages table with JSONB fields for flexible data storage.

How to set up

Gmail OAuth2: Enable Gmail API in Google Cloud Console, create OAuth2 credentials
PostgreSQL: Create database and run the SQL schema provided in setup sticky note
S3/MinIO: Create bucket "gmail-attachments" with proper upload permissions
Configure: Update authenticatedUserEmail in transform scripts to your email
Test: Start with single email before enabling bulk processing

How to customize

Email filters: Modify Gmail queries (in:sent, in:inbox) to target specific emails
Storage structure: Change S3 file path format in Upload node
Processing schedule: Adjust trigger frequencies based on email volume
Database fields: Extend PostgreSQL schema for additional metadata
Attachment types: Add file type filtering in binary processing logic

Note: This workflow processes emails from the last hour to avoid overwhelming the system. Adjust timeframes based on your email volume and processing needs.

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 - SYSTEM OVERVIEW

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

Block 2 - SETUP REQUIREMENTS

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

Block 3 - SYSTEM TRIGGERS

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

Block 4 - EMAIL RETRIEVAL

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

Block 5 - ATTACHMENT PROCESSING

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

Block 6 - DATA MAPPING

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

Block 7 - DATA TRANSFORMATION

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

Block 8 - DATABASE STORAGE

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

Block 9 - SCRIPT: Extract Binary

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

Block 10 - SCRIPT: Email Transform

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

Block 11 - Process Items Loop

Type / Role: n8n-nodes-base.splitInBatches - splitInBatches
Config choices: Version 3

Block 12 - Extract Binary Metadata

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

Block 13 - Link Email Attachments

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

Block 14 - Structure Fields

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

Block 15 - Final Merge

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 16 - Aggregate Attachments

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

Block 17 - Insert or Update Database

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 18 - Binary Data Filter

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

Block 19 - Upload to Storage

Type / Role: n8n-nodes-base.s3 - s3
Config choices: Version 1

Block 20 - Flow Convergence

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

Block 21 - End Loop

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

Block 22 - Get Individual Message

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

Block 23 - Get Many Sent

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

Block 24 - Get Many Inbox

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

Showing the first 24 of 30 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Sync Gmail emails to PostgreSQL with S3 attachment storage
Complexity	advanced
Nodes	30
Categories	Document Extraction
Author	Jose Cuartas
Published	23 Sept 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/8871/8871.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 Document Extraction workflows

Frequently asked questions

What does Sync Gmail emails to PostgreSQL with S3 attachment storage 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 Document Extraction use case.

Jose Cuartas

1 workflow

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.splitinbatches n8n-nodes-base.code n8n-nodes-base.set n8n-nodes-base.merge n8n-nodes-base.aggregate n8n-nodes-base.postgres n8n-nodes-base.filter

Complexity

advanced

Published 23 Sept 2025

Likes 0

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Install path: /data/workflows/8871/8871.json

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Sync Gmail emails to PostgreSQL with S3 attachment storage

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Sync Gmail emails to PostgreSQL with S3 attachment storage

Who's it for

What it does

How it works

Requirements

How to set up

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - SYSTEM OVERVIEW

Block 2 - SETUP REQUIREMENTS

Block 3 - SYSTEM TRIGGERS

Block 4 - EMAIL RETRIEVAL

Block 5 - ATTACHMENT PROCESSING

Block 6 - DATA MAPPING

Block 7 - DATA TRANSFORMATION

Block 8 - DATABASE STORAGE

Block 9 - SCRIPT: Extract Binary

Block 10 - SCRIPT: Email Transform

Block 11 - Process Items Loop

Block 12 - Extract Binary Metadata

Block 13 - Link Email Attachments

Block 14 - Structure Fields

Block 15 - Final Merge

Block 16 - Aggregate Attachments

Block 17 - Insert or Update Database

Block 18 - Binary Data Filter

Block 19 - Upload to Storage

Block 20 - Flow Convergence

Block 21 - End Loop

Block 22 - Get Individual Message

Block 23 - Get Many Sent

Block 24 - Get Many Inbox

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