Relay access denied

Relay access denied

My Zoho email address was working fine to send and receive emails.

But now I'm able to send emails, not to receive them. For instance, if I try to send an email from Gmail to my Zoho email address, the below error is happening: 

Reporting-MTA: dns; googlemail.com
Received-From-MTA: dns; xxxxxxx@gmail.com
Arrival-Date: Thu, 06 Apr 2017 21:56:27 -0700 (PDT)
X-Original-Message-ID: <50c03ef3-748c-b8f7-b362-48b8a248d515@gmail.com>

Final-Recipient: rfc822; xxxxx.xxxxxx@cybit.com.br
Action: delayed
Status: 4.7.1
Remote-MTA: dns; mx.cybit.com.br. (200.234.222.116, the server for the domain cybit.com.br.)
Diagnostic-Code: smtp; 454 4.7.1 <xxx.xxxxx@cybit.com.br>: Relay access denied
Last-Attempt-Date: Fri, 07 Apr 2017 22:59:16 -0700 (PDT)
Will-Retry-Until: Sun, 09 Apr 2017 21:56:28 -0700 (PDT)