Look, arxiv.org is awesome and I love them, but they really can't expect the ITU or abuse-reporting groups to bail them out here. If you have some web service

Look, arxiv.org is awesome and I love them, but they really can't expect the ITU or abuse-reporting groups to bail them out here. If you have some web service that sends emails, it's on you to pick a sensible rate limit for it (not 1,000,000 messages per day unless you're Fastmail) and to hierarchically bucket that ratelimit by the routable prefix (first 24 bits) of the requester's IP address. As the bucket empties, respond more and more slowly. This way the worst a DDoSer can do is mildly annoy people who happen to use the same ISP that they do -- but eventually even those people will still get through. I'm sorry, but this is just the sort of thing everybody has to do in order to preserve a decentralized Internet. Because if we don't all do this sort of stuff, pretty soon it won't be the Internet anymore, it'll be the CloudflareNet. Alright go ahead, downvote me to negative-billion. I can handle it.