Delayed Message: Sender account disabled
The email message has not yet been delivered because, according to the sender's email provider email system, the email account for the sender is disabled. Possible reasons are lack of payment or evidence of a compromised system.
In the sender's email program's account settings, look for "SMTP" (which is about sending email) and then "authentication". Under Authentication, ensure that the username and password for the sender's email account are entered there correctly.
If they are entered correctly and you still get this error, contact the email provider for help.
4.7.13: Official Definition
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.
Sometimes a system administrator will have to disable a user's account (e.g., due to lack of payment, abuse, evidence of a break-in attempt, etc). This error code occurs after a successful authentication to a disabled account. This informs the client that the failure is permanent until the user contacts their system administrator to get the account re-enabled. It differs from a generic authentication failure where the client's best option is to present the passphrase entry dialog in case the user simply mistyped their passphrase.