<virtual-mta ipv4_only> bind-ip 203.0.113.5 only # 'only' flag forces IPv4 </virtual-mta>
Looking for help with PowerMTA 60r3? Check the official Port25 archives (mirrored on Archive.org) or join specialized email deliverability forums. As always, ensure you are compliant with anti-spam laws before deploying any MTA at scale. powermta 60r3