# Relais Docs

> Relais is an open-source email forwarding service that lets you use custom domains with Gmail.

- [Introduction](https://relais.sh/docs/overview/introduction)
- [Comparison](https://relais.sh/docs/overview/comparison)
- [How It Works](https://relais.sh/docs/overview/how-it-works)
- [Quickstart](https://relais.sh/docs/getting-started/quickstart)
- [DNS Setup](https://relais.sh/docs/getting-started/dns-setup)
- [Gmail Send As](https://relais.sh/docs/getting-started/gmail-send-as)
- [Architecture](https://relais.sh/docs/security/architecture)
- [Data Handling](https://relais.sh/docs/security/data-handling)
- [Encryption](https://relais.sh/docs/security/encryption)
- [Prerequisites](https://relais.sh/docs/self-hosting/prerequisites)
- [Deploy Stalwart](https://relais.sh/docs/self-hosting/deploy-stalwart)
- [Deploy App](https://relais.sh/docs/self-hosting/deploy-app)
- [DNS](https://relais.sh/docs/self-hosting/dns)
- [Troubleshooting](https://relais.sh/docs/troubleshooting)