Mail delivery failed: returning message to sender

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:

  @gmail.us
    host mail244170.maychuemail.com [123.30.244.170]
    SMTP error from remote mail server after RCPT TO:<@gmail.vn>:
    550 5.1.1 Recipient unknown <@gmail.vn>

Reporting-MTA: dns; mail9362.maychuemail.com

Action: failed
Final-Recipient: rfc822;
Status: 5.0.0
Remote-MTA: dns; mail244170.maychuemail.com
Diagnostic-Code: smtp; 550 5.1.1 Recipient unknown

View Error

No action is required on your part. Delivery attempts will continue for some
time, and this warning may be repeated at intervals if the message remains
undelivered. Eventually the mail delivery software will give up, and when
that happens, the message will be returned to you.

Reporting-MTA: dns; sg-relay2.hostatom.com

Action: delayed
Final-Recipient: rfc822;
Status: 4.0.0

Return-path: <*****@gmail.com>
Received: from sv1.carpetmaker.co.th ([147.50.231.33])
    by sg-relay2.hostatom.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
    (Exim 4.89_1)
    (envelope-from <******@gmail.com>)
    id 1pllRy-0001Y1-8b; Mon,