I know this is already a common question, i tried to google it. but its not helping. i tried to play with the codes but still not working.
<tr>
<th><label>Admin Email: </label></th>
<td><input type="text" name="adminemail" value="<?php echo esc_html( empty($options['adminemail'])?'':$options['adminemail'] ); ?>" /></td>
</tr>
//----------------------//
$admin_mail = empty($options['adminemail'])?'':$options['adminemail'];
$headers = 'Content-type: text/html';
$email_title = htmlspecialchars_decode( get_bloginfo(), ENT_QUOTES ) . " - New Booking Made" ;
//---------------------//
@wp_mail( $admin_mail, $email_title, $message, $headers );