Hacker News Reader

> Either that, or you need your own IPs.

Or just use IPv6, which will probably fix this.

This'll stop being true at cheap VPS providers as soon as spammers cotton on, and then VPS providers ranges will be blocked in /48s (even if you only get a /128 or /64 from your VPS provider) because it's not worth the hassle of doing anything smaller.

Why is this considered a useful signal by Gmail? Isn't it cheaper for a spammer to get throwaway IPv6 addresses?

Most spammers aren’t competent to provision an IPV6 service correctly, especially one with matched PTR and SPF(TXT) records, and using throwaway v6 addresses makes SPF much harder. It’s also easy to spot, at which point you can tag the sender domain with a bad reputation.

It’s no surprise that Gmail et al are more interested in sender domain reputation, and also the graph of related domains, than they were a few years ago.

Reply on news.ycombinator.com