4 ms·
My guess is that the defaults are designed to block a similar amount of spam if possible? Most major mail providers have access to one or more ipv4 addresses.
by onphonenow 4y ago
My guess is that the defaults are designed to block a similar amount of spam if possible?
Most major mail providers have access to one or more ipv4 addresses. This allows for reputation + it's a bit more wasteful to burn through ipv4 blocks on spam campaigns.
ipv6 address are plentiful, so you can burn through them on a spam campaign.
- nybble41 4y agoIPv6 addresses are more plentiful. However, you don't assign reputation to an individual IPv6 address but rather to an IPv6 network prefix (a /64, or even /60). That gives roughly the same granularity as a single public IPv4 address: one ISP subscriber.
- onphonenow 4y agoFalse, the cost of a prefix is MUCH MUCH lower if you are looking to spam via ipv6. Total prefixes are 18,446,744,073,709,551,615
- nybble41 4y agoNaturally there are far more IPv6 /60s than IPv4 /32s. As a spammer, though, you don't get to pick just any /60 prefix you want—it has to be allocated to you.