We also slowly but surely are moving towards IPv6 which will make reputation based on IP somewhat useless when I can have as many new IP addresses as I want. Th

We also slowly but surely are moving towards IPv6 which will make reputation based on IP somewhat useless when I can have as many new IP addresses as I want. They would have to make all newly seen IPv6 addresses not trusted by default when bad actor could send each email from different IPv6 address.