Validate support in your installed software release before deployment.
Configuration
smtp-vmta1 unix - - n - - smtp
-o smtp_bind_address=192.0.2.10
-o smtp_helo_name=mail.example.comValidation
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.