Hello, > Same situation here, Microsoft suddenly blocking our main server for all > M365 domains with the same 5.7.511 error code. No indications on what > could have possibly triggered the issue. All DMARC reports are clean, no > marketing emails, no known hacked accounts, no clear suspects. The > supposed promised Microsoft "mitigation" did not do anything. > > The email scene is getting tricky with both Google and Microsoft acting > as completely random black boxes.
Well, this is why companies should stop to trust G and M for the mail. We are all responsible about our lazyness with mail... And this is only the start of issues... Kind regards, xavier _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
