Validate support in your installed software release before deployment.
Configuration
<virtual-mta vmta1>
smtp-source-host 192.0.2.10 mail1.example.com
</virtual-mta>Validation
Back up the current configuration, run the product-specific syntax check, reload safely, and review logs after a controlled test.
Production notes
Correct DNS identity, envelope routing, bounce handling and reputation controls are as important as the directive itself.