Hey everyone! I'm trying to get a clearer picture of the different sending limits in Microsoft 365, specifically between Exchange Online limits and the Anti-Spam Outbound Policy. The Exchange Online limit is set at 10,000 recipients per day and 30 messages per minute, while I understand that the Anti-Spam policy allows for customizable limits for internal and external recipients. I'm curious about a few things: What happens to a user when these limits are hit? Do they receive a non-delivery report (NDR) error email, or is it more serious, like an account lock? Additionally, if someone reaches the 10,000-recipient limit, can an admin reset that counter, or do they have to wait the full 24 hours? And finally, for the Anti-Spam policy, is unblocking a user in the Defender portal the only way to reactivate sending capabilities? I'm looking for the best emergency strategies for when someone accidentally triggers these limits. Thanks for your help!
2 Answers
The Exchange Online limits are hard caps—like 10,000 recipients per day or 30 messages per minute. Once you hit one of those limits, your account gets flagged, you’ll usually have to wait around 24 hours before being able to send emails again, and you'll get an NDR for any messages that fail during that time. On the other hand, the Anti-Spam Outbound Policy is more flexible. If a user reaches those limits, it really depends on how your policies are set up—they could just get blocked from sending, or admins might get notified about it. If they’re restricted due to this policy, an admin will have to handle the release manually.
Both limits generate NDRs when enforced, but how they affect the account is different. The Exchange limits have a relatively straightforward 24-hour reset, whereas the Anti-Spam restrictions require manual action to unblock a user. So if you want to avoid manual intervention, make sure your users know their limits!
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