Add initial project files.

JackMail.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.808.3
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "JackMail", "JackMail\JackMail.csproj", "{970B9ABF-A628-4804-B7C7-257BC0DF1B56}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{970B9ABF-A628-4804-B7C7-257BC0DF1B56}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{970B9ABF-A628-4804-B7C7-257BC0DF1B56}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{970B9ABF-A628-4804-B7C7-257BC0DF1B56}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{970B9ABF-A628-4804-B7C7-257BC0DF1B56}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AD439AF1-92B7-4026-9249-EF111B6F9E2E}
+	EndGlobalSection
+EndGlobal

JackMail/JackMail.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Worker">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <UserSecretsId>dotnet-JackMail-3363D956-FACF-45AF-9B24-53666388FBC1</UserSecretsId>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="5.0.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Services\" />
+  </ItemGroup>
+</Project>

JackMail/Program.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using JackMail.Services;
+
+namespace JackMail
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureServices((hostContext, services) =>
+                {
+                    services.AddHostedService<Send>();
+                    services.AddHostedService<Receive>();
+                    services.AddHostedService<Retrieve>();
+                });
+    }
+}

JackMail/Properties/launchSettings.json

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+{
+  "profiles": {
+    "JackMail": {
+      "commandName": "Project",
+      "dotnetRunMessages": "true",
+      "environmentVariables": {
+        "DOTNET_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

JackMail/Services/Receive.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace JackMail.Services
+{
+    public class Receive : BackgroundService
+    {
+        private readonly ILogger<Receive> _logger;
+
+        public Receive(ILogger<Receive> logger)
+        {
+            _logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+                await Task.Delay(1000, stoppingToken);
+            }
+        }
+    }
+}

JackMail/Services/Retrieve.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace JackMail.Services
+{
+    public class Retrieve : BackgroundService
+    {
+        private readonly ILogger<Retrieve> _logger;
+
+        public Retrieve(ILogger<Retrieve> logger)
+        {
+            _logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+                await Task.Delay(1000, stoppingToken);
+            }
+        }
+    }
+}

JackMail/Services/Send.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace JackMail.Services
+{
+    public class Send : BackgroundService
+    {
+        private readonly ILogger<Send> _logger;
+
+        public Send(ILogger<Send> logger)
+        {
+            _logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+                await Task.Delay(1000, stoppingToken);
+            }
+        }
+    }
+}

JackMail/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

JackMail/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}