public void ConfigureServices(IServiceCollection services)
        {
services.AddTransient<SmtpClient>((serviceProvider) =>
            {
                var config = serviceProvider.GetRequiredService<IConfiguration>();
                return new SmtpClient()
                {
                    Host = config.GetValue<String>("Email:Smtp:Host"),
                    Port = config.GetValue<int>("Email:Smtp:Port"),
                    Credentials = new NetworkCredential(
                            config.GetValue<String>("Email:Smtp:Username"),
                            Utility.DeCrypt(config.GetValue<String>("Email:Smtp:Password"))
                        )
                };
            });
        }

        [HttpPost]
        public async Task<IActionResult> PasswordRecovery()
        {
            using (var smtpClient = HttpContext.RequestServices.GetRequiredService<SmtpClient>())
            {
//....
                bl.PasswordRecovery(smtpClient);               
//.....
return Ok("OK");
            }
        }