On Tue, Jan 11, 2022 at 02:04:56PM -0500, Mark G Thomas via mailop wrote: > > I'm not generally involved in our support issues, but a coworker at > my work (Linode) reached out to me about what looks to be a new problem > involving hosting customers being blocked by by Microsoft. We have > 150-200 new support tickets about this, starting on December 21, 2021. > Our support goes back and forth with the customers and tries to help, > typically 4 responses, but up to 48, per ticket, and both support and > customers are growing increasingly frustrated.
Thanks for the support! Mine is one of those hundreds of tickets (FYI 16748061). relay=hotmail-com.olc.protection.outlook.com[104.47.14.33]:25, delay=0.85, delays=0.04/0.02/0.63/0.16, dsn=5.7.1, status=bounced (host hotmail-com.olc.protection.outlook.com[104.47.14.33] said: 550 5.7.1 Unfortunately, messages from [66.175.223.185] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [VI1EUR04FT006.eop-eur04.prod.protection.outlook.com] (in reply to MAIL FROM command)) Based on discussion in HN, it seems Microsoft has suddenly blocked off large parts of the Internet sometime in late December, the delivery problem is much broader than Linode IP space. Aside from filing a ticket with Linode (due to the "Please contact your Internet service provider since part of their network is on our block list" part in the message) I also tried various ways to contact Microsoft directly with limited success. I received prompt replies but they are the same bot-reply form letter, so not clear if anyone is reading them. I got the same response that Linode got (based on the support ticket) "Not qualified for mitigation 66.175.223.185/32 Our investigation has determined that the above IP(s) do not qualify for mitigation." However, today I tried writing to my friend at hotmail.com again and this time didn't get the IP-based block bounce, so at least something has changed. I'll follow up offline with him later to see if anything got delivered or not. -- Jyri J. Virkki - Santa Cruz, CA -- _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
