Mail delivery failed: returning message to sender

[Mail Delivery System]

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  do-not-reply@example.com
    Domain continentaltradezone.com has exceeded the max defers and failures per hour (5/5 (100%)) allowed. Message discarded.