Interesting perspective. My primary mailserver is AWS lightsail, my test mailserver is DigitalOcean. Both have a process to request a ‘good’ IP address. The lat

Interesting perspective. My primary mailserver is AWS lightsail, my test mailserver is DigitalOcean. Both have a process to request a ‘good’ IP address. The latter works with ipv6, despite being (in my opinion) a lower credibility service.