They did the same here, eventually .. however as has been mentioned here before, this really doesn’t scale well Grey listing is one thing, but an out and out blacklist is (imho) a bad idea. First you have to know there is an issue before you can fix it, and then you have to wait 24-48 hours to get it fixed. In the mean time, your customers emails are being permanently rejected Then, I guess they’re free to run their mail system however they choose ... ☹ Jon Morby www.fido.net From: Mark Dale via mailop Sent: 10 June 2020 11:27 To: mailop@mailop.org Subject: Re: [mailop] t-online.de outage?
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
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