An Open-Source Gmail Alternative for the Future of Email
What is Zero?
Zero is an open-source AI email solution that gives users the power to self-host their own email app while also integrating external services like Gmail and other email providers. Our goal is to modernize and improve emails through AI agents to truly modernize emails.
Why Zero?
Most email services today are either closed-source, data-hungry, or too complex to self-host.
0.email is different:
✅ Open-Source – No hidden agendas, fully transparent.
🦾 AI Driven - Enhance your emails with Agents & LLMs.
🔒 Data Privacy First – Your emails, your data. Zero does not track, collect, or sell your data in any way. Please note: while we integrate with external services, the data passed through them is not under our control and falls under their respective privacy policies and terms of service.
⚙️ Self-Hosting Freedom – Run your own email app with ease.
📬 Unified Inbox – Connect multiple email providers like Gmail, Outlook, and more.
🎨 Customizable UI & Features – Tailor your email experience the way you want it.
🚀 Developer-Friendly – Built with extensibility and integrations in mind.
Tech Stack
Zero is built with modern and reliable technologies:
Before running the application, you'll need to set up services and configure environment variables. For more details on environment variables, see the Environment Variables section.
Setup Options
You can set up Zero in two ways:
Standard Setup (Recommended)
Quick Start Guide
Clone and Install
# Clone the repository
git clone https://github.com/Mail-0/Zero.git
cd Zero
# Install dependencies
pnpm install
# Start database locally
pnpm docker:db:up
Set Up Environment
Run pnpm nizzy env to setup your environment variables
Run pnpm nizzy sync to sync your environment variables and types
Start the database with the provided docker compose setup: pnpm docker:db:up
[!WARNING]
The authorized redirect URIs in Google Cloud Console must match exactly what you configure in the .env, including the protocol (http/https), domain, and path - these are provided above.
Run pnpm nizzy env to setup your environment variables. It will copy the .env.example file to .env and fill in the variables for you.
For local development a connection string example is provided in the .env.example file located in the same folder as the database.
Database Setup
Zero uses PostgreSQL for storing data. Here's how to set it up:
Start the Database
Run this command to start a local PostgreSQL instance:
pnpm docker:db:up
This creates a database with:
Name: zerodotemail
Username: postgres
Password: postgres
Port: 5432
Set Up Database Connection
Make sure your database connection string is in .env file. And you have ran pnpm nizzy sync to sync the latest env.
If you run pnpm dev in your terminal, the studio command should be automatically running with the app.
Sync
Background: https://x.com/cmdhaus/status/1940886269950902362
We're now storing the user's emails in their Durable Object & an R2 bucket. This allow us to speed things up, a lot.
This also introduces 3 environment variables, DROP_AGENT_TABLES,THREAD_SYNC_MAX_COUNT, THREAD_SYNC_LOOP.
DROP_AGENT_TABLES: should the durable object drop the threads table before starting a sync
THREAD_SYNC_MAX_COUNT: how many threads should we sync? max 500 because it's using the same number for the maxResults number from the driver. i.e 500 results per page.
THREAD_SYNC_LOOP: should make sure to sync all of the items inside a folder? i.e if THREAD_SYNC_MAX_COUNT=500 it will sync 500 threads per request until the folder is fully synced. (should be true in production)
Zero（Mail0）是一款开源、可自托管的邮件应用，可以把 Gmail、Outlook 等邮箱服务整合到同一个收件箱中，并借助 AI 智能体增强功能，同时保护你的数据隐私。