Cannot send email to Zoho mail

Cannot send email to Zoho mail

Hi, I am able to receive mails, but when I use other mail to send to Zoho I receive the following issues:

Error Details
Reported error: 550 5.1.1 <dn3point@iamzhaoyuan.com> Recipient not found. <http://x.co/irbounce>
DSN generated by: HK2PR01MB0689.apcprd01.prod.exchangelabs.com
Remote server: p3plibsmtp02-06.prod.phx3.secureserver.net

I send from microsoft outlook. Please help, thanks.