SMTP Mailer Issue

I have been able to successfully send mail with PHPMailer tutorial code like this...

isSMTP();
//Enable SMTP debugging

$mail->SMTPAuth = true;
$mail->SMTPDebug = 2;
$mail->Host = 'ssl://smtp.yandex.ru';
$mail->Port = 465;
$mail->Username = 'EDITED';
$mail->Password = 'EDITED';
//Set the hostname of the mail server

//Set the SMTP port number - likely to be 25, 465 or 587

//Whether to use SMTP authentication

//Username to use for SMTP authentication

//Password to use for SMTP authentication

//Set who the message is to be sent from
$mail->setFrom('EDITED', 'Daniel');
//Set an alternative reply-to address
$mail->addAddress('EDITED', 'Daniel');
//Set who the message is to be sent to
//Set the subject line
$mail->Subject = 'PHPMailer SMTP test';
$mail->Body = 'This is a plain-text message body';

//send the message, check for errors
if (!$mail->send()) {
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Message sent!';
}
?>

Unfortunately, none of the contact forms work that I upload to my site... with or without recaptcha (Recaptcha displays and is solved correctly).
https://withdaniel.ru (Message in footer)
or
https://withdaniel.ru/contact-2.html (It turns grey and nothing happens. Just an example. Not going to use)

I'm guessing form.php needs to be updated to work with newer PHPMailer?

To clarify, the Canvas code works if I use PHP mailing (nonsmtp).

Thanks for the help. I've changed it back to $mail->SMTPDebug = 0; Still no luck. I click submit and the form turns grey. I run https://withdaniel.ru/test.php (with the debug code 2 or 0) and it works.

Nevermind! You got it. Sorry I must've missed something. Thanks guys! Will definitely do business in the future and look at your other projects.