The mailbox is full because the user has exceeded a per-mailbox administrative quota or physical capacity.
The general semantics implies that the recipient can delete messages to make more space available.
These failures include the full range of problems resulting from implementation errors or an unreliable connection.
The message content or media status codes report failures involving the content of the message.
This code should be used as a persistent transient failure.
A per-mailbox administrative message length limit has been exceeded. The general semantics imply that the individual recipient may not be able to delete material to make room for additional messages.
The human readable text after the status code contains the new priority, followed by SP (space) and explanatory human readable text.The networking or routing codes report status about the delivery system itself.These system components include any necessary infrastructure such as directory and routing services.These codes report failures due to translation, transcoding, or otherwise unsupported message media.Message content or media issues are under the control of both the sender and the receiver, both of which must support a common set of supported content-types.The outbound connection was established, but was unable to complete the message transaction, either because of time-out, or inadequate connection quality.