4.3.3 Email Bounce Error
Reason
Message Features Not Supported By Receiving System: Delayed Message
The email message has not yet been delivered because the message seems to contain features not supported by the receiving system. Typically, this occurs when systems have differing capabilities.
How to fix?
Contact the sender’s email system support team to investigate what feature of your email system may not be supported by the receiving system. This usually requires some level of support to fix.
4.3.3 – 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.3.3
Selected features specified for the message are not supported by the destination system. This can occur in gateways when features from one domain cannot be mapped onto the supported feature in another.
5.3.3 Email Bounce Error
Reason
Message Features Not Supported: Message Not Delivered
The message could not be delivered because the message you are sending seems to contain features not supported by the receiving system. Typically, this occurs when systems have differing capabilities.
How to fix?
Contact the sender’s email system support team to investigate what feature of your email system may not be supported by the receiving system. This usually requires some level of support to fix.
5.3.3- 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.3.3
Selected features specified for the message are not supported by the destination system. This can occur in gateways when features from one domain cannot be mapped onto the supported feature in another.
