4.1.7 Email Bounce Error
Reason
Sender’s Address Is Written Incorrectly: Delayed Message
The email message has not yet been delivered because the sending address is not a valid email address.
How to fix?
Review the sender’s email address to identify any misspellings or missing letters. In the settings or options of the sender’s email program or webmail service, ensure that your own email address is entered correctly.
4.1.7 – 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.1.7
The sender's address was syntactically invalid. This can apply to any field in the address.
5.1.7 Email Bounce Error
Reason
Sender’s Address Is Written Incorrectly: Message Not Delivered
The message could not be delivered because the sending address is not a valid email address.
How to fix?
Review the sender’s email address to identify any misspellings or missing letters. In the settings or options of the sender’s email program or webmail service, ensure that your own email address is entered correctly.
5.1.7 – 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.1.7
The sender's address was syntactically invalid. This can apply to any field in the address.
