4.4.1 Email Bounce Error
Reason
Network Is Busy: Delayed Message
The email message has not yet been delivered because the recipient’s email provider did not respond to the sender’s email provider’s request to connect.
How to fix?
The sender’s email system will retry this message a few more times and provide further updates. If the sender is not notified within a few days that the message was delivered, try sending it again. Or contact the recipient another way, such as phone or text message.
4.4.1 – 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.4.1
The outbound connection attempt was not answered, because either the remote system was busy, or was unable to take a call. This is useful only as a persistent transient error.
5.4.1 Email Bounce Error
Reason
Network Is Busy: Message Not Delivered
The message could not be delivered because the recipient’s email provider did not respond to the sender’s email provider request to connect.
How to fix?
The sender’s email system will retry this message a few more times and provide further updates. Iif the sender is not notified within a few days that the message was delivered, try sending it again. Or contact the recipient another way, such as phone or text message.
5.4.1- 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.4.1
The outbound connection attempt was not answered, because either the remote system was busy, or was unable to take a call. This is useful only as a persistent transient error.
