On November 7, 2019, thousands of people awoke and checked their phones, as on any other morning, only to discover messages that seemed to have been transported from another time. And so, this Valentine’s Day Server Failure should alert policymakers to the need to ensure that our regulatory infrastructure keeps pace with technological change. Together, this network consolidation and weak regulatory oversight give rise to important safety, security, and competition concerns. Regulatorily, the Federal Communications Commission recently reclassified text messaging services, placing them beyond the Agency’s regulatory ambit. Technically, the text messaging system is surprisingly consolidated, creating effective bottlenecks (and isolated points of failure) in our communications network. These failures highlight the fragility of our communications infrastructure-both technical and regulatory. And yet there has been surprisingly little regulatory attention to this failure, among others, in the text messaging system. If these sorts of messages had been trapped and later released, the results might have been far more concerning: Evacuation orders might have been lost, or late-arriving public safety warnings might have sparked misplaced panic. Text messages help to enable a wide variety of critical applications, from public safety missives to corporate security protocols. By the time these messages reached their recipients, their worlds had changed: Heartfelt valentines arrived from loves now lost other late-arriving messages seemed to come from the ghosts of the recently passed. Support is unable to lift the throttling here.On February 14, 2019, hundreds of thousands of text messages were ensnared in a defective communications server-only to be released months later. If customers don't want to wait that long, they can switch to using another mailbox as long as the issue has been resolved. The throttling period will be decided by Microsoft based on a number of factors. These messages are not accepted by Microsoft 365 so Message Trace is of no help here.Īfter correcting the issue, the mailbox will begin working again after the throttling period expires in the same way that hitting the Recipient Rate Limit for a mailbox requires waiting for that throttling to elapse. Investigating this will be on the client side. If and when these errors are hit, they'll need to investigate the misconfiguration in cases such as Send As denied or correct new issues such as a mailbox becoming full. It's up to administrators or users to test these applications to make sure that they work when configured. Lastly, if a mailbox is left to reach its size limit, a previously working application will hit this new error and be throttled if it is ignored. In such a scenario, messages that were successfully sent will be blocked as well. However, the mailbox could be configured to send out emails successfully with one application and misconfigured with another. In many of these cases, customers might fail to notice that anything is wrong and the forgotten application will continue trying to send to no avail. If Exchange Online sees too many errors during submissions for a mailbox related to the five issues covered, that mailbox will be throttled from sending using SMTP AUTH specifically for a period of time. 550 5.2.255 Sender throttled due to continuous invalid recipients errors.
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