Why is there an error when submitting an email form?

Question

PHP

Hey guys. Problem.
On the local (open server) messages are sent to "Ura". But after uploading to the hosting, the form gives an error when submitting, see for yourself: byjan.ru/CHPU/order.php
What's the matter? There are suspicions?
Here is an example code:

Answer 1

snippet from phpmailer example

if(!$mail->send()) {
  echo 'Message was not sent.';
  echo 'Mailer error: ' . $mail->ErrorInfo;
} else {
  echo 'Message has been sent.';
}

Not enough data for error output
var_dump($mail)