On 10 Jun 2020, at 10:20, Hetzner Blacklist via mailop <mailop@mailop.org> wrote: > As far as I know this isn't a bug, it's a feature.
Joy. > For the past few years, T-Online have been moving to a system where they > block all unknown IPs. How exactly they define that is not 100% clear, > but it seems to be any IPs that haven't recently sent them email. > > So if an IP hasn't sent them email in the recent past, it is > automatically on their blacklist. By default. I thought I'd do a check on this assertion and it does appear to be accurate. $workplace outbound servers get a 220. Amusingly (or perhaps not) the new mailop server, which we haven't switched in yet, gets the same 554 as everyone else. That strikes me very much as a "does not scale well" approach. Graeme _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
