Failed to send email in wordpress custom plugin with SMTP plugin configured

Solution:

this is my working code

function sendEmail($name,$email,$message,$subject)
{
    global $signature;
    $message .= "<br>" . $signature; 
 
    $admin = get_option('admin_email');
    $to = $email;
    $headers = 'Content-Type: text/html; charset=UTF-8';
    $headers .= "From: . $admin . \r\n" ;
    $headers .= "Reply-To: . $admin . \r\n" ;
  

    $sent = wp_mail($to, $subject, $message, $headers);

    if($sent)
        return true;
    else
        return false;

}