Hello Mailop, For the past two years things have been going really well for us in regards to the Microsoft blacklist. We've had very few issues, probably because we aggressively check the SNDS and block/terminate IPs/clients that send spam to Microsoft. Now, all of a sudden and without warning, Microsoft has blacklisted the entire range 5.9.0.0/16.
Just to show how extreme that is, of our almost 1.4 million IPs, Microsoft has currently blacklisted 70,390, of which 65,496 are from the range above. So without that range, Microsoft would have around 5,000 blacklisted IPs (a number I'm very proud of considering three years ago that was at 380,000). I, along with many customers, have sent delist requests to Microsoft, but only a handful of them have been accepted. Even the escalations team (the actual humans) can't help. I don't understand why, and am looking for answers, as are the confused/angry customers contacting us about this. I'm hoping I can reach Michael Wise through this post, since I don't see any other way of clarifying this situation. If anybody else has any tips or advice though, I would obviously appreciate that as well. Please note that I fully understand (and support) blacklisting single IPs, and can understand why blacklists like Microsoft do escalation listings of /24s. The question here is about an entire /16. Kind regards Bastiaan van den Berg --------------------- Hetzner Online GmbH _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
