![]() Support is unable to lift the throttling here. If customers don't want to wait that long, they can switch to using another mailbox as long as the issue has been resolved. If your email servers have been blacklisted. Some email systems are known to reject emails from blacklisted domains and IP automatically with the 550 status code. It’s possible that the server IP or the domain that you use to send the emails is blacklisted by an anti-spam filter. The throttling period will be decided by Microsoft based on a number of factors. Method 3: Verifying if the server IP or Domain is blacklisted. ![]() Relay simply refers to the transmission of your email from. 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. Your email has bounced due to a temporary error, which could be on the sending or receiving side. Investigating this will be on the client side. related server) to start sending messages for the specified domain to an. 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. responsibility for errors or omissions, or for damages resulting from the use. 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.550 5.2.254 Sender throttled due to continuous too many recipients errors.550 5.2.253 Sender throttled due to continuous invalid license errors. ![]()
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