Adding Smtp section in appsettings, registering IEmailSender as an email service and ofc the MailKit nuget in Infrastructure proj

src/Umbraco.Infrastructure/Runtime/CoreInitialComposer.cs

@@ -320,6 +320,7 @@ namespace Umbraco.Core.Runtime
             composition.RegisterUnique<IEventMessagesAccessor, HybridEventMessagesAccessor>();
             composition.RegisterUnique<ITreeService, TreeService>();
             composition.RegisterUnique<ISectionService, SectionService>();
+            composition.RegisterUnique<IEmailSender, EmailSender>();
 
             composition.RegisterUnique<IExamineManager, ExamineManager>();
 

src/Umbraco.Infrastructure/Umbraco.Infrastructure.csproj

@@ -11,6 +11,7 @@
       <PackageReference Include="LightInject.Annotation" Version="1.1.0" />
       <PackageReference Include="LightInject.Microsoft.DependencyInjection" Version="3.3.0" />
       <PackageReference Include="LightInject.Microsoft.Hosting" Version="1.2.0" />
+      <PackageReference Include="MailKit" Version="2.6.0" />
       <PackageReference Include="Markdown" Version="2.2.1" />
       <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.2" />

src/Umbraco.Web.UI.NetCore/appsettings.json

@@ -116,6 +116,16 @@
                     "Replacement": ""
                 }
             ]
+        },
+        "Global": {
+            "Smtp": {
+                "From": "noreply@example.com",
+                "Host": "127.0.0.1",
+                "Port": 25,
+                "UserName": "username",
+                "Password": "password",
+                "DeliveryMethod": "network"
+            }
         }
     }
   }