My domain is sattvameditationresort.com. I've updated MX records with those of Zoho. But i can't send any mails to this email id from gmail. I have checked the MX status with MXTOOLS, its showing the correct entry either. The error is as shown below:

Message not delivered Your message couldn't be delivered to info@sattvameditationresort.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, or login to the IMAP/POP3 server before sending your message. mail-oi0-f42.google.com [209.85.218.42]:34009 is not permitted to relay through this server without authentication.