4.5.6 Email Bounce Error
Reason
Messaging Command In Transmission Too Long: Delayed Message
The email message has not yet been delivered because mailing protocol parameters were not met as the commands used in message transmission were too long.
How to fix?
Try sending the message again in a while as this problem might be temporary or already in the process of being fixed. If this error persists, contact the email provider for help.
4.5.6- 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.5.6
This enhanced status code SHOULD be returned when the server fails the AUTH command due to the client sending a [BASE64] response which is longer than the maximum buffer size available for the currently selected SASL mechanism. This is useful for both permanent and persistent transient errors.
5.5.6 Email Bounce Error
Reason
Messaging Command In Transmission Too Long: Message Not Delivered
The message could not be delivered because mailing protocol parameters were not met as the commands used in message transmission were too long.
How to fix?
Try sending the message again in a while as this problem might be temporary or already in the process of being fixed. If this error persists, contact the email provider for help.
5.5.6- 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.5.6
This enhanced status code SHOULD be returned when the server fails the AUTH command due to the client sending a [BASE64] response which is longer than the maximum buffer size available for the currently selected SASL mechanism. This is useful for both permanent and persistent transient errors.
