Hi, On Tue, May 29, 2018 at 8:31 AM, Rupert Gallagher <r...@protonmail.com> wrote: > We reject e-mails from both dynamic and unknown domains, and feed the > firewall with their CIDRs. The resulting blacklist includes 919 CIDRs, and > keeps growing by itself. It is all automatic. I think ISPs should do this > filtering, even if the EFF would scream like Donal Duck in favour of net > neutrality.
How are you determining that an IP is dynamic? We're using a set of postfix regexes but it's very dated now. More details would be appreciated :-)
