One common scenario is that the sender's email is quarantined. You may see different types of errors you can refer to this article to get an overview of all the error codes and possible fixes. This is a common issue in which the recipient mailbox does not contain the proxy address if this is the case, the proxy address must be added to the mailbox. You can search for the mailbox in the Exchange Admin Center (EAC).Įven if the mailbox is found, you must check whether the address used in the email is present in the proxies of the recipient mailbox. The first task is to ascertain whether the user mailbox exists in your tenant. The Microsoft 365 servers did receive the email from the external sender however, the recipient wasn't found in the tenant. Run a message trace again with the sender and recipient addresses and the appropriate timeline. Since we are still exploring the portal to run message traces, we will pursue that path.
Your aim is to find the cause of the issue and to ensure that a permanent fix is applied. Scenario: You have noticed that some emails sent to a specific user do not get delivered. You will learn about them in this section. It's important to understand the different status types you might encounter while running message traces. In the previous section, you learned about the filtered as spam status for a message trace.
This link shows how you can whitelist an email address in Microsoft 365. If you feel this is a legitimate email, you can ask the user to whitelist it from their mailbox, or if you think other users may also need this sender's emails to be delivered to their inboxes, then you can whitelist the sender in EOP. The email was deemed spam by Exchange Online Protection (EOP).
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