Notice: Undefined index: email in /var/www/vind.ru/www/calculator/post.php on line 10

Warning: file_put_contents(email.txt): failed to open stream: Permission denied in /var/www/vind.ru/www/calculator/post.php on line 11

Notice: Undefined index: values in /var/www/vind.ru/www/calculator/post.php on line 12

Fatal error: Uncaught exception 'phpmailerException' with message 'Invalid address: ' in /var/www/vind.ru/www/calculator/class.phpmailer.php:770
Stack trace:
#0 /var/www/vind.ru/www/calculator/class.phpmailer.php(706): PHPMailer->addAnAddress('to', NULL, '')
#1 /var/www/vind.ru/www/calculator/post.php(33): PHPMailer->addAddress(NULL)
#2 {main}
  thrown in /var/www/vind.ru/www/calculator/class.phpmailer.php on line 770