initial commit.

not working

MailAddressVisualizerSource/MailAddressModel.cs

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+using System.Runtime.Serialization;
+namespace MailAddressVisualizerSource;
+
+[DataContract]
+public class MailAddressModel
+{
+    [DataMember]
+    public string DisplayName { get; set; } = "";
+
+    [DataMember]
+    public string Email { get; set; } = "";
+}
+

MailAddressVisualizerSource/MailAddressObjectSource .cs

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+using Microsoft.VisualStudio.DebuggerVisualizers;
+using System.Net.Mail;
+
+namespace MailAddressVisualizerSource;
+
+public class MailAddressObjectSource : VisualizerObjectSource
+{
+    public override void GetData(object target, Stream outgoingData)
+    {
+        if (target is MailAddress mail)
+        {
+            var result = new MailAddressModel
+            {
+                DisplayName = mail.DisplayName,
+                Email = mail.Address,
+            };
+            SerializeAsJson(outgoingData, result);
+        }
+    }
+}

MailAddressVisualizerSource/MailAddressVisualizerSource.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+	  <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.VisualStudio.DebuggerVisualizers" Version="17.6.1032901" />
+  </ItemGroup>
+
+</Project>