On Wed, 2020-06-10 at 11:20 +0200, Hetzner Blacklist via mailop wrote: > As far as I know this isn't a bug, it's a feature. > > 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. > > It's useless for ISPs (like us) to try and contact them to delist IPs, > they want to hear directly from the admin of the (mail) server. > > They also have fairly strict requirements for delisting an IP. > >
For what it's worth, T-Online were blocking mail from one of our discussion-list servers yesterday; but an email ( with log extracts, explaining the who and what of things) from our postmaster to theirs requesting the block be lifted was responded to very quickly and politely - and the block lifted a few hours later. In short: a stellar response from T-Online. Cheers, Mark _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
