hi i am facing an issue to send email from my server when i try to send i got a reply like this below:

Reporting-MTA: dns; aburayan.net
X-Postfix-Queue-ID: 4G64pX10lhz20mpc
X-Postfix-Sender: rfc822; fuad@aburayan.net
Arrival-Date: Fri, 18 Jun 2021 16:57:08 +0000 (UTC)

Final-Recipient: rfc822; fuadseed@gmail.com
Original-Recipient: rfc822;fuadseed@gmail.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; relay.dynu.com
Diagnostic-Code: smtp; 530 SMTP authentication is required.



Are i need to do any changes to Postfix file ?