contact form 7 not sending email

Hey, first time having a problem like this with contact form 7, basicly when i input the data, it wont send the email even tho it should be configured correctly, basicly copy pasted from enougher site too where it works.
Backend looks like this:

<div class="row kontakt-form">			
 <div class="form-group col-sm-6">
    [text* your-name placeholder "mjeno"] 
 </div>
 <div class="form-group col-sm-6">
    [email* your-email placeholder "e-mail"]
</div>
<div class="form-group col-12">
    [textarea* your-message placeholder "powěs?"] 
</div>
<div class="col-12 py-4">
<div class="row">
<div class="col-sm-4">
[submit "wotpós?a?"]</div><div class="col-sm-8">[checkbox* checkbox-535 "Haj, sym Informaciju k datowemu ?kitej ?ita? a p?ih?losuju tutej."]
</div></div>
</div>
</div>

thanks for the help

The page I need help with: [log in to see the link]