How to check if correct email address is entered?
I have this code

    <?php
    if(isset($_POST['submit'])) { 
    $to =  "info@bodom.eu"; 
    $subject =  "Form"; 
    $name_field =  $_POST['name']; 
    $email_field =  $_POST['email']; 
    $message =  $_POST['message']; 
  
    $body =  "From: $name_field\n E-Mail: $email_field\n Message:\n $message"; 
  
    echo "<div id='messageok'> Ok. <br /><span> Thank you. </span></div>"; 
    mail($to, $subject, $body);
    }  else { 
    echo "<div id='messageok'> Error. </div>";
    } 
    ?>

and I need to check if the fields in the form are filled and if e-mail address is correct. Yes, I found many tutorials, but I am not very good in PHP and this code works for me. Thank you.
How to check if correct email address is entered?
===

I have this code

    <?php
    if(isset($_POST['submit'])) { 
    $to =  "info@bodom.eu"; 
    $subject =  "Form"; 
    $name_field =  $_POST['name']; 
    $email_field =  $_POST['email']; 
    $message =  $_POST['message']; 
  
    $body =  "From: $name_field\n E-Mail: $email_field\n Message:\n $message"; 
  
    echo "<div id='messageok'> Ok. <br /><span> Thank you. </span></div>"; 
    mail($to, $subject, $body);
    }  else { 
    echo "<div id='messageok'> Error. </div>";
    } 
    ?>

and I need to check if the fields in the form are filled and if e-mail address is correct. Yes, I found many tutorials, but I am not very good in PHP and this code works for me. Thank you.