Are there specific configurations or settings within PHP that could prevent bounces from being returned when using the mail() function?

When using the mail() function in PHP, bounces may not be returned if the email headers are not set correctly. To ensure that bounces are returned, you can set the Return-Path header to the sender's email address. This can be done by including an additional parameter in the mail() function call. 

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email";
$headers = "From: sender@example.com\r\n";
$return_path = "-f sender@example.com";
mail($to, $subject, $message, $headers, $return_path);

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PHP mail() function configurations settings prevent bounces

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