public async Task <IHttpActionResult> PostSendEmails([FromBody] List <Guid> guIdList, [FromUri] int templateId)
        {
            var contactsForSending = await manager.GetContactsByGuIdList(guIdList);

            if (contactsForSending == null)
            {
                return(NotFound());
            }
            try
            {
                provider.SendEmailList(contactsForSending, templateId);
            }
            catch (Exception ex)
            {
                return(BadRequest(ex.Message));
            }
            return(Ok("Thank you!!! "));
        }