Maps specific IP addresses to distinct sending "identities." This allows you to separate marketing traffic from transactional emails. smtp-source-ip 1.2.3.4 Use code with caution.
Virtual MTAs define your outbound infrastructure. They link specific local network interfaces (IP addresses) to public-facing identities. powermta config file link
Before restarting the service, validate your config file to avoid syntax errors: Maps specific IP addresses to distinct sending "identities