In this post, let’s have a look at the error message “4.4.7 – Message expired” that you get when working with Microsoft 365 Exchange Online.
These are the errors that you usually receive when there is a problem in delivering the email message that was sent by you. These errors are generated and sent by Office 365. This is usually alled as DSN which stands for delivery status notification or in simple words bounce messages.
NDR or Non-delivery report is one of the common type of message that you receive which indicates to the user that the email was not delivered.
Error Message
4.4.7 – Message expired
Error Details
The message in the queue has expired. The sending server tried to relay or deliver the message, but the action wasn’t completed before the message expiration time occurred. This message can also indicate that a message header limit has been reached on a remote server, or some other protocol time-out occurred while communicating with the remote server.
This message usually indicates an issue on the receiving server. Check the validity of the recipient address, and determine if the receiving server is configured correctly to receive messages.
You might have to reduce the number of recipients in the message header for the host about which you’re receiving this error. If you send the message again, it’s placed in the queue again. If the receiving server is available, the message is delivered.
For more information, see Fix email delivery issues for error code 4.4.7 in Exchange Online.
