![]() The sending server tried to relay or deliver the message, but the action was not completed before the message expiration time occurred. The error should also include the IP address of the server or service that’s generating the error, which you can use to identify the party responsible for fixing this. This error almost always indicates an issue with the receiving server or network outside of Microsoft 365 or Office 365. Microsoft 365 or Office 365 is trying to send a message to an email server outside of Microsoft 365 or Office 365, but attempts to connect to it are failing due to a network connection issue at the external server’s location. Email NDR Error Codes NDR codeĬonnection refused Hopefully the possible cause and additional information can point you in the right direction to solve your problem. The following table lists the various NDR’s that Exchange Online/Office 365 can throw. To find out how you can start managing Office 365 licenses and mailboxes directly from AD Users & Computers, check this article: To get a better understanding of the routing information in the mail header, read this. ![]() If you find it hard, use a web service to analyze it. With some practice, you’ll be able to interpret mail headers with ease. Have a thorough look at it, so you don’t end up blaming the wrong system. ![]() Most likely, the original email message header is included in its entirety in the NDR. Was it generated by your own sending mail server, your outbound proxy, the receiving mail server, or maybe a mail gateway in front of the recipient mail system? To fully understand the NDR make sure you have a clear picture of where in the mail flow the NDR was generated. The root cause can be a lot of things related to either the sending or receiving mail system configuration, the mailbox configuration, the specific contents of the email, etc. To solve the underlying problem of the NDR, you need to understand where and why this particular error code was generated.
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