PHPMailer emails NOT sending sometimes because of multiple tests? - php

Question

I am having issues with mail NOT going to all email addresses sometimes. I have been testing from a web-app I built and it is hosted with GoDaddy with "Deluxe" shared hosting level.
Is it possible that I have upset the GoDaddy Email Server gods by submitting too many test email sends??
Is it possible that my emails are being blocked because the servers think my multiple tests are spam? I do receive SOME of the emails....
// Import PHPMailer classes into the global namespace
// These must be at the top of your script, not inside a function
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
//Load Composer's autoloader
require 'vendor/autoload.php';
$mail = new PHPMailer(true); // Passing `true` enables exceptions
try {
// Server settings
$mail->SMTPDebug = 2; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'xxxxxxxxxxxx.prod.phx3.secureserver.net'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'cpanelusername'; // SMTP username
$mail->Password = 'cpanelpassword'; // SMTP password
$mail->SMTPSecure = 'tls'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 587; // TCP port to connect to
// Recipients - Names are optional - $mail->setFrom('xxxxxxxxxx#cox.net', 'Peter Henry Lee');
$mail->setFrom('xxxxxxxxxx#cox.net'); // From Address
$mail->addAddress('xxxxxxxxxx#cox.net'); // Recipient 1
$mail->addAddress('xxxxx#cox.net'); // Recipient 2
$mail->addCC('xxxxxxx#cox.net'); // Cc 1 Address
$mail->addCC('xxxxxxxx#cox.net'); // Cc 2 Address
$mail->addBCC('xxxxxxxxx#xxxxesigns.com'); // Bcc Address
// $mail->addReplyTo('xxxxxxxxx#xxxxesigns.com'); // Reply-To Address
// Attachments
include 'retrieve_order.php'; // Retrieves PDF
$mail->addAttachment('receipts/' . $newname); // Adds PDF attachment
// $mail->addAttachment('img/puppy2.png', 'Puppy is cute!'); // Adds Image attachment with optional name
// Content
$newname = substr($newname, 0, 11);
$l = $newname;
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = 'Here is the TEST ' . $l . ' subject line';
$mail->Body = 'This is the TEST ' . $l . ' HTML message body <b>in bold!</b>';
$mail->AltBody = 'This is the TEST ' . $l . ' body in plain text for non-HTML mail clients';
// Send mail
$mail->send();
echo 'Message has been sent';
} catch (Exception $e) {
echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}