Postfix configuration with phpmailer or mail

SYSTEM INFORMATION
OS type and version Rocky latest
Webmin version Latest
Virtualmin version Latest
Related packages Postfix

Trying to setup postfix configuration with phpmailer for a virtual server. Sort of works but still having some issues. Anyone have success with this. Sample of my phpmailer setup below - curious to know what settings should be enabled and disabled on the postfix config:
BTW the main issue I am having here is that when I generate an email it works only if I send it to my main outlook address. If I try to send it to any other email address it doesn’t get received - weird.

Is there a way to reset postfix back to default settings in case I pooch the configuration?

$mail->isHTML(true);
			$mail->SMTPDebug  = 3;
			$mail->Debugoutput = 'html';
			$mail->SMTPOptions = array(
				'ssl' => array(
					'verify_peer' => false,
					'verify_peer_name' => false,
					'allow_self_signed' => true
				)
			);
			$mail->Encoding = "base64";
			$mail->SMTPAuth = true;
			$mail->Host = "iqedtest.imatr.org";
			$mail->Port = 587;
			//$mail->AuthType = 'LOGIN';
			$mail->Username = "contact@iqedtest.imatr.org";
			$mail->Password = '--------------------------4';
			
			$mail->SMTPSecure = 'SSL';           
			
			$mail->AddAddress($school_email);//verifyable school email
			
			$mail->Subject    = $emailsubject;
			
			$mail->MsgHTML($messageuser);
			
			$mail->send();

I’m no Postfix maven, but I never had to do anything to make it work.

have you checked you mail logs for errors.

Duplicate of Mail issue: smtp cannot authenticate