Mail delivery failed: returning message to sender

Mail Delivery System
Sun Mar 26 20:13:01 GMT 2023

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:
    Domain has exceeded the max emails per hour (313/250 (125%)) allowed.  Message discarded.

More information about the Cygwin mailing list