# Roundcube 1. Copy `.env.example` to `.env` and replace the example mail-server values. 2. Start the container: ```powershell docker compose up -d ``` 3. Open [http://localhost:9002](http://localhost:9002) and sign in with your mail credentials. The container publishes Roundcube on host port `9002`. SMTP uses port `587` by default and the `tls://` server prefix, which makes Roundcube negotiate STARTTLS. Its database is retained in the named `roundcube-db` volume.