Amazon SES throwing error 500 when I try to send email - amazon-web-services

Question

I've set up the Amazon SES on my ec2 instance as in this link
The test file is working fine and sending the email when I use the command php teste.php on the terminal on my ec2 instance, the problem is when I try to make a post request to access this file and send the email, it's throwing an error 500 and I don't know how to fix it.
here is the error message on chrome:
and on Insomnia:
here is my test file:
<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
// location of your Composer autoload.php file.
require '../../../home/ec2-user/vendor/autoload.php';
$sender = 'email#email.com';
$senderName = 'Teste';
$recipient = 'email#email.com';
$usernameSmtp = '[removed for security]';
$passwordSmtp = '[removed for security]';
$host = 'email-smtp.sa-east-1.amazonaws.com';
$port = 587;
$subject = 'Amazon SES test (SMTP interface accessed using PHP)';
$bodyText = "Email Test\r\nThis email was sent through the
Amazon SES SMTP interface using the PHPMailer class.";
$bodyHtml = '<h1>Email Test</h1>
<p>This email was sent through the
Amazon SES SMTP
interface using the <a href="https://github.com/PHPMailer/PHPMailer">
PHPMailer</a> class.</p>';
$mail = new PHPMailer(true);
try {
$mail->isSMTP();
$mail->setFrom($sender, $senderName);
$mail->Username = $usernameSmtp;
$mail->Password = $passwordSmtp;
$mail->Host = $host;
$mail->Port = $port;
$mail->SMTPAuth = true;
$mail->SMTPSecure = 'tls';
$mail->addCustomHeader('X-SES-CONFIGURATION-SET');
$mail->addAddress($recipient);
$mail->isHTML(true);
$mail->Subject = $subject;
$mail->Body = $bodyHtml;
$mail->AltBody = $bodyText;
$mail->Send();
echo "Email sent!", PHP_EOL;
} catch (phpmailerException $e) {
echo "An error occurred. {$e->errorMessage()}", PHP_EOL;
} catch (Exception $e) {
echo "Email not sent. {$mail->ErrorInfo}", PHP_EOL;
}

Answer 1

You need to open port 587 on your instance's security group to make it work.
A similar question asked on aws developer form
EDIT
using SSL
$mail->Host = 'ssl://email-smtp.sa-east-1.amazonaws.com';
$mail->SMTPSecure = 'tls';
$mail->Port = 443;