class Emailer {

    public boolean sendEmail(List<ContactList> listOfContactLists, String subject, String body) throws AddressException, MessagingException {
        return sendEmail(listOfContactLists, subject, body, null);
    }

    public  Emailer(MailTemplate mailTemplate);
      Emailer(MailTemplate mailTemplate, MailPackageStaticDependenciesWrapper facadeToWebappAndMailhelper);
    public  Emailer(OLATPrincipal senderPrincipal, boolean tryInstitutionalEmail, MailTemplate mailTemplate);
      Emailer(OLATPrincipal senderPrincipal, boolean tryInstitutionalEmail, MailTemplate mailTemplate, MailPackageStaticDependenciesWrapper facadeToWebappAndMailhelper);

}