On Tue, Mar 03, 2026 at 01:10:53PM +0100, Lukas Adrian Kron via mailop wrote: > Something did change indeed. > We, as a small volume sender are seeing 451 4.7.650 S775 errors for the > first time. > No blockage. Maybe they switched over from sending the 451's to any IP in > the /24 > and actually sending it to the IP.
"Users fume over Outlook.com email 'carnage' "Email flow slowed or stopped by mysterious forces at Microsoft" https://www.theregister.com/2026/03/04/users_fume_at_outlookcom_email/ That explains some problems that I have seen. -- Alain Williams Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer. +44 (0) 787 668 0256 https://www.phcomp.co.uk/ Parliament Hill Computers. Registration Information: https://www.phcomp.co.uk/Contact.html #include <std_disclaimer.h> _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
