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:

  cygwin@cygwin.com
    Domain ozilayakkabi.com has exceeded the max emails per hour (313/250 (125%)) allowed.  Message discarded.