4.3.1 Email Bounce Error
Reason
Email System Is Full: Delayed Message
The email message has not yet been delivered because of an issue with the recipient’s email provider.
How to fix?
Wait a few minutes, double check the recipient’s email address and try sending the message again. If this error continues, consider contacting the recipient through an alternative email address or other means.
4.3.1 – 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.3.1
Mail system storage has been exceeded. The general semantics imply that the individual recipient may not be able to delete material to make room for additional messages. This is useful only as a persistent transient error.
5.3.1 Email Bounce Error
Reason
Email System Is Full: Message Not Delivered
The message could not be delivered because the recipient’s email system is out of space and cannot store any more messages.
How to fix?
Wait a few minutes, double check the recipient’s email address and try sending the message again. If this error continues, consider contacting the recipient through an alternative email address or other means.
5.3.1 – 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.3.1
Mail system storage has been exceeded. The general semantics imply that the individual recipient may not be able to delete material to make room for additional messages. This is useful only as a persistent transient error.
