code: protected void configureSession(Session session) {
  		if(! session.getProperties().contains(MAIL_SMTP_ALLOW8BITMIME)) {
  			session.getProperties().put(MAIL_SMTP_ALLOW8BITMIME, "true");
  		}
  	}
docs: override to configure JavaMail {@link Session}
  
  in order to specify a default, override this method and add
  
  <code>
  if(! session.getProperties().contains("mail.smtp.from")) {
  session.getProperties().put("mail.smtp.from", "bounces@foobar.com");
  }
  </code>
  
  @param session the session