kleen/postfix repository overview

This image provides a preconfigured Postfix setup that only requires a few environment variables for a smarthost. It then acts as a simple mail relay inside the local Docker network, aggregating outbound mail delivery.

Required variables:

• POSTFIX_RELAYHOST: Hostname of the smarthost
• POSTFIX_RELAYUSER: Username on the smarthost
• POSTFIX_RELAYPASS: Password on the smarthost

Optional variables:

• POSTFIX_RELAYPORT: Port on the relay host (default: 587)
• POSTFIX_CA_FILE: Path to a custom CA bundle

Alternatively, you can mount your own main.cf and run Postfix with a fully custom configuration.