Date: Wed, 11 Oct 2023 16:27:13 +0200 From: Alessio Cecchi <[email protected]> > I confirm that, emails in the queue are only to > "eur0x.prod.outlook.com" MX.
Not for us in UK. Of MXs that give 451 4.7.500 Server busy. Please try again later from ... (S77719) about 50% self-identify as EU, but also many from eop-AUS01.prod.protection.outlook.com namprd02.prod.outlook.com eop-gbr01.prod.protection.outlook.com etc. So no correlation for us. It's throttling that causes delivery delays of over 10 hours in some cases. Problem began around 0100 UTC. MS has little public apart from https://learn.microsoft.com/en-us/answers/questions/1388775/outlook-com-servers-tells-server-busy-please-try-a "Some users may encounter delays receiving external email messages in Exchange" "We’ve identified that a recent service update, applied to a section of infrastructure responsible for enforcing IP address anti-spam rules, contains a change which is inadvertently causing impact. We’re developing and validating a fix to revert to the most recent stable service version to remediate impact. In parallel, we’re continuing to manually add reported affected IP addresses to an allowed list to alleviate impact in the short term." CK _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
