4.4.5 Email Bounce Error
Reason
Overloaded Network: Delayed Message
The email message has not yet been delivered because the email system was unable to deliver the message due to recipient’s email network being congested or overloaded.
How to fix?
Try waiting a bit since the mail server is busy. The sender’s email provider will retry this message a few more times to see if the message gets through and provide further updates.
4.4.5- 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.4.5
The mail system was unable to deliver the message because the mail system was congested. This is useful only as a persistent transient error.
5.4.5 Email Bounce Error
Reason
Overloaded Network: Message Not Delivered
The email message has not yet been delivered because the email system was unable to deliver the message due to recipient’s email network being congested or overloaded.
How to fix?
Try waiting a bit since the mail server is busy. The sender’s email provider will retry this message a few more times to see if the message gets through and provide further updates.
5.4.5- 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.4.5
The mail system was unable to deliver the message because the mail system was congested. This is useful only as a persistent transient error.
