4.3.2 Email Bounce Error
Reason
Receiving Email System Not Operating: Delayed Message
The email message has not yet been delivered because one or more of the recipients’ email systems is not accepting messages, possibly due to an unplanned shutdown, excessive load, or system maintenance.
How to fix?
Try sending the message again later or contact in other way.
4.3.2 – Official definition from ITEF
For the code that starts from 4.X.X
A persistent transient failure is one in which the message as sent is valid, but persistence of some temporary condition has caused abandonment or delay of attempts to send the message. If this code accompanies a delivery failure report, sending in the future may be successful.
For the code that starts from X.3.2
The host on which the mailbox is resident is not accepting messages. Examples of such conditions include an immanent shutdown, excessive load, or system maintenance. This is useful for both permanent and persistent transient errors.
5.3.2 Email Bounce Error
Reason
Receiving Email System Not Operating: Message Not Delivered
The message could not be delivered because one or more of the recipients’ email systems is not accepting messages, possibly due to an unplanned shutdown, excessive load, or system maintenance.
How to fix?
Try sending the message again later or contact in other way.
5.3.2- Official definition from ITEF
For the code that starts from 5.X.X
A permanent failure is one which is not likely to be resolved by resending the message in the current form. Some change to the message or the destination must be made for successful delivery.
For the code that starts from X.3.2
The host on which the mailbox is resident is not accepting messages. Examples of such conditions include an immanent shutdown, excessive load, or system maintenance. This is useful for both permanent and persistent transient errors.
