Hello, I did all the mx settings on my dns panel, and the zoho mx configuration says everything is right as well. I've been able to send emails but I don't receive any.

That's the error the sender receives when try to send me an email:

550 Please turn on SMTP Authentication in your mail client, or login to the IMAP/POP3 server before sending your message. mail-lj1-f179.google.com [209.85.208.179]:34813 is not permitted to relay through this server without authentication.

Somebody can give me some urgent help? Thank you!