Final-Recipient: rfc822;  sv@laindus.com
Action: failed
Status: 5.0.0
Remote-MTA: dns;  mail.laindus.com. (166.62.28.127, the server for the domain  laindus.com.)
Diagnostic-Code: smtp; 550-Please turn on SMTP Authentication in your mail client.
  550-mail-oi0-f49.google.com [209.85.218.49]:33044 is not permitted to relay
 550 through this server without authentication.
Last-Attempt-Date: Wed, 17 May 2017 02:30:40 -0700 (PDT

receiving this mail when trying to send an email to sv@laindus.com
Plzz help