public async Task <ActionResult <SendingResponse> > SendMail([FromBody] SendMailRequest sendRequest)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest());
            }

            bool isUserValid = await _userService.IsUserValid(sendRequest.Sender);

            if (isUserValid)
            {
                return(Ok(await _mailingService.SendMail(sendRequest.Sender, sendRequest.MailViewModel)));
            }

            return(BadRequest("Invalid user!"));
        }
 public void SendPayslips()
 {
     this.repository.GetAll()
     .ToList()
     .ForEach(x => mailingService.SendMail(x.Email));
 }