Contact Form Queen not working

Hey guys, my contact form page doesn't work. There is the answer, that my email was successful sended, but i haven't got an email.

I have the Theme: Queen

Here the Debug:
Notice: Undefined index: detailttl in /home/u765049255/public_html/wp-content/themes/Liebling/inc/library.php on line 53

Hi!
To get rid of this notice you just need to remove the code:

<?php if ($SMTheme->get( 'contactform','detailttl' ) != '') {?>
<h3><?php echo $SMTheme->get( 'contactform','detailttl' )?></h3>
<?php } ?>

from your feedback.php file located inside the theme directory.
Besides, you would better check up your spam box. Perhaps, this messages are there or your mail server may block this messages. If you get message "Your message has been successfully sent!" that means this message has been really sent. There is no other way. You may also try to specify another email on page Theme Settings -> Contact Form in the dashboard of your website.