Response codes for failed delivery fall into two categories: Deferred (4xx) and Rejected (5xx). Response codes, subcodes, and messages vary among mail providers, but must comply with relevant RFC specifications. You know when major projects are coming, so why not give Microsoft a heads up? This is helpful, not only as a best practice for planning a migration but also to ensure that you get the best performance possible.SMTP responses provide a brief explanation of why an email message was not delivered. The key is to have a process in place to address these challenges. Now that we have addressed what do after throttling has occurred, how can we be proactive about it? ![]() These best practices should always be attempted before any escalation or “panic.” Microsoft provides some great guidance around what do in case of throttling, so always refer to that before taking any drastic measures.īlog post: How to Develop a Top-Down Office 365 Governance Strategy That Won’t Falterīe Proactive About Throttling in Large Projects Try to work with our Cloud Ops team to reduce the number of threads assigned to this tenant and prevent overload, or work with your engineer to set up an app profile if you haven’t yet. If Microsoft is reporting these issues, that truly means their servers are busy cramming in more calls won’t help the situation.
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