Postfix Multi-Instance Configuration
Operate isolated Postfix instances for distinct roles or source identities.
Production note: Back up configuration, run
postfix check, and stage changes before reloading.Use cases
Separate inbound and outbound roles, dedicated IP identities, or policy domains when a single instance becomes hard to reason about.
Instance management
postmulti -e init
postmulti -I postfix-out -e create
postmulti -p statusIsolation
Assign separate data directories, queue directories, listeners, logs, and source IPs.
Complexity
Multi-instance deployments increase operational complexity. Document ownership and test upgrades across every instance.