docs: @Override
  	public Response updateEmailConfig(String CorpNum, String EmailType, Boolean SendYN, String UserID)
  			throws PopbillException {
  		if (SendYN == null)
  			throw new PopbillException(-99999999, "메일전송여부(SendYN)가 입력되지 않았습니다.");
  		if (EmailType == null || EmailType.isEmpty())
  			throw new PopbillException(-99999999, "메일전송유형(EmailType)이 입력되지 않았습니다.");
  				
  		return httppost("/Statement/EmailSendConfig?EmailType=" + EmailType + "&SendYN=" + String.valueOf(SendYN),
  				CorpNum, null, UserID, "", Response.class);
  	}