Hi List, was about to write the same just when Andreas' mail popped up. Also noticing an increasing amount of mails towards Microsoft getting deferred with 451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S77719)
We see this happening for different from-domains as well for different sender-IPs since about 0300 UTC and have also reports of other ISP having the same issue. We are using their SNDS and none of the sender-IPs are flagged on their side. Maybe someone from MS could take a look into this as our queues are piling up. Best Kevin ________________________________ Von: mailop <[email protected]> im Auftrag von Andreas via mailop <[email protected]> Gesendet: Mittwoch, 11. Oktober 2023 11:12:39 An: [email protected] Betreff: [mailop] outlook.com 421 try again later S77719 Hello all, since a few hours we have problems with sending to Microsoft. We get hundreds of messages like in the subject with the reference to S77719. Also colleagues from other companies in germany are seeing the same in their logs. All mails that are blocked here are from Microsoft customers, but they are redirected through our servers. Trying to unblock the IP e.g. via https://sender.office.com/ shows that the IPs are not blocked. Anybody have any idea? Thanks a lot Andreas
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