Sending email to list of emails

Question

I'm using the latest version of PHPMailer to send an email to 3 emails on the same domain.

All the emails, The one I send emails from and the 3 other emails I send messages to are on the same domain, It's a business Gmail account.

Here is the code:

//Including PHPMailer files
require_once('phpmailer/src/phpmailer.php');
require_once('phpmailer/src/SMTP.php');
require_once('phpmailer/src/Exception.php');

$msg = '';

//List of emails
$recipients = array('info@mydomain.com', 'help@mydomain.com', 'schedule@mydomain.com');

//Initializing PHPMailer
$mail = new PHPMailer\PHPMailer\PHPMailer();                              // Passing `true` enables exceptions

try {

    //Sender data
    $mail->setFrom('admin@mydomain.com', 'Admin');
    $mail->addReplyTo('info@mydomain.com', 'Admin');

    //Content
    $mail->isHTML(true);                                  // Set email format to HTML
    $mail->Subject = 'Hello World!';
    $mail->Body    = 'Hello World!';
    $mail->AltBody = 'Hello World!';

    //Loop through the emails list
    foreach ($recipients as $recipient) {

        $mail->addAddress($recipient);

        if (!$mail->send()) {
            echo "Mailer Error (" . str_replace("@", "&#64;", $recipient) . ') ' . $mail->ErrorInfo . '<br />';
            break; //Abandon sending
        } else {
            echo "Message sent to :"  . ' (' . str_replace("@", "&#64;", $recipient) . ')<br />';
        }

        // Clear all addresses and attachments for next loop
        $mail->clearAddresses(); 
        $mail->clearAttachments();

    }

} catch (Exception $e) {
    echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}

When I run the script on the same domain I get the following output:

Message sent to : (info@mydomain.com)
Message sent to : (help@mydomain.com)
Message sent to : (schedule@mydomain.com)

But when I check the inbox of these emails, I don't find the email.

I tried to get the mail.log file by:

ini_set('mail.log', __DIR__ . 'mail.log');

But it didn't work and I can't use $mail->SMTPDebug = 2;, As I'm not using SMTP.