550 Please turn on SMTP Authentication in your mail client - can't send email from my Gmail

550 Please turn on SMTP Authentication in your mail client - can't send email from my Gmail

I got this error, please help. I already configure the settings. I can't send email from my Gmail but I can send and received email from my zoho account.

Message not delivered

Your message couldn't be delivered to support@chatbotprime.com because the remote server is misconfigured. See technical details below for more information.
The response was:

550 Please turn on SMTP Authentication in your mail client. mail-qt0-f173.google.com [209.85.216.173]:54875 is not permitted to relay through this server without authentication.