Change required fields in php contact form

I want to change my php form so that only the email address is required.

I think these might be the areas to change:

// Validate form fields
if(empty($email) || filter_var($email, FILTER_VALIDATE_EMAIL) === false){
$valErr .= 'Please enter a valid email.<br/>';
}

if(empty($valErr)){

PHP:

<!-- Status message -->
<?php if(!empty($statusMsg)){ ?>
<div class="status-msg <?php echo $status; ?>"><?php echo $statusMsg; ?></div>
<?php } ?>

<!-- Form fields -->
<div class="form-input" style="display:flex; flex-direction: row; justify-content: space-between; align-items: center">
<label for="Name">name&nbsp;&nbsp;&nbsp;</label>
<input type="text" name="name" value="<?php echo !empty($postData['name'])?$postData['name']:''; ?>">
</div>

PHP:

Thanks much!