Strictly, that's dynamic IPs. The Venn diagram may almost be circular, but not quite. Part of the point being that it's much easier to block static IPs, while a spammer on a dynamic IP will evade any blocks when their IP address changes.
My in-laws outbound email broke recently because, being on a dynamic IP, they'd been set up to send through their ISP's smarthost. Then they changed ISP :P.
Strictly, that's dynamic IPs. The Venn diagram may almost be circular, but not quite. Part of the point being that it's much easier to block static IPs, while a spammer on a dynamic IP will evade any blocks when their IP address changes.
My in-laws outbound email broke recently because, being on a dynamic IP, they'd been set up to send through their ISP's smarthost. Then they changed ISP :P.