Delayed Message: Email system sent bad command
The email message has not yet been delivered because the sender's email provider used a messaging command that the recipient's email provider didn't recognize.
Retry the email message see if it was a one-time problem or if the same error occurs.
Otherwise, contact the support team as the sender's mail system issued a command that is not supported by the recipient's email provider. This typically requires helpdesk support.
4.5.2: Official Definition
[RFC3463] (Standards Track) from the The Internet Engineering Task Force (IETF) definition for codes that start with 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.
[RFC3463] (Standards Track) from the The Internet Engineering Task Force (IETF) definition for codes that end with X.5.2:
A mail transaction protocol command was issued which could not be interpreted, either because the syntax was wrong or the command is unrecognized. This is useful only as a permanent error.
Need more help?
Ask our experts
All about other bounce errors.