diff --git a/src/libraries/System.Net.Mail/src/System.Net.Mail.csproj b/src/libraries/System.Net.Mail/src/System.Net.Mail.csproj
index 60d0a7259e2e83..d1d9176a5e879f 100644
--- a/src/libraries/System.Net.Mail/src/System.Net.Mail.csproj
+++ b/src/libraries/System.Net.Mail/src/System.Net.Mail.csproj
@@ -1,8 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-Unix;$(NetCoreAppCurrent)-Browser</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-Unix;$(NetCoreAppCurrent)-Browser;$(NetCoreAppCurrent)-tvOS</TargetFrameworks>
     <Nullable>enable</Nullable>
+    <DefineConstants Condition="'$(TargetstvOS)' == 'true'">$(DefineConstants);NO_NTAUTHENTICATION</DefineConstants>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <ItemGroup>
@@ -87,14 +88,10 @@
     <Compile Include="System\Net\Mail\SmtpReplyReaderFactory.cs" />
     <Compile Include="System\Net\Mail\SmtpTransport.cs" />
     <Compile Include="System\Net\Mail\SmtpLoginAuthenticationModule.cs" />
-    <Compile Include="System\Net\Mail\SmtpNegotiateAuthenticationModule.cs" />
-    <Compile Include="System\Net\Mail\SmtpNtlmAuthenticationModule.cs" />
     <Compile Include="System\Net\Mail\MailWriter.cs" />
     <Compile Include="System\Net\Mail\NetEventSource.Mail.cs" />
     <Compile Include="$(CommonPath)System\Net\ContextAwareResult.cs"
              Link="Common\System\Net\ContextAwareResult.cs" />
-    <Compile Include="$(CommonPath)System\Net\NTAuthentication.Common.cs"
-             Link="Common\System\Net\NTAuthentication.Common.cs" />
     <Compile Include="$(CommonPath)System\Net\DebugCriticalHandleMinusOneIsInvalid.cs"
              Link="Common\System\Net\DebugCriticalHandleMinusOneIsInvalid.cs" />
     <Compile Include="$(CommonPath)System\Net\DebugCriticalHandleZeroOrMinusOneIsInvalid.cs"
@@ -111,30 +108,38 @@
              Link="Common\System\Collections\Generic\BidirectionalDictionary.cs" />
     <Compile Include="$(CommonPath)System\NotImplemented.cs"
              Link="Common\System\NotImplemented.cs" />
+    <Compile Include="$(CommonPath)System\Net\Security\NetEventSource.Security.cs"
+             Link="Common\System\Net\Security\NetEventSource.Security.cs" />
+    <Compile Include="$(CommonPath)System\Net\SecurityProtocol.cs"
+             Link="Common\System\Net\SecurityProtocol.cs" />
+  </ItemGroup>
+
+  <!-- NT authentication specific files -->
+  <ItemGroup Condition="'$(TargetsBrowser)' != 'true' and '$(TargetstvOS)' != 'true'">
     <Compile Include="$(CommonPath)System\Net\ContextFlagsPal.cs"
              Link="Common\System\Net\ContextFlagsPal.cs" />
     <Compile Include="$(CommonPath)System\Net\NegotiationInfoClass.cs"
              Link="Common\System\Net\NegotiationInfoClass.cs" />
+    <Compile Include="$(CommonPath)System\Net\NTAuthentication.Common.cs"
+             Link="Common\System\Net\NTAuthentication.Common.cs" />
     <Compile Include="$(CommonPath)System\Net\SecurityStatusPal.cs"
              Link="Common\System\Net\SecurityStatusPal.cs" />
     <Compile Include="$(CommonPath)System\Net\Security\SafeCredentialReference.cs"
              Link="Common\System\Net\Security\SafeCredentialReference.cs" />
     <Compile Include="$(CommonPath)System\Net\Security\SSPIHandleCache.cs"
              Link="Common\System\Net\Security\SSPIHandleCache.cs" />
-    <Compile Include="$(CommonPath)System\Net\Security\NetEventSource.Security.cs"
-             Link="Common\System\Net\Security\NetEventSource.Security.cs" />
-    <Compile Include="$(CommonPath)System\Net\SecurityProtocol.cs"
-             Link="Common\System\Net\SecurityProtocol.cs" />
-    <Compile Include="$(CommonPath)Interop\Windows\Interop.UNICODE_STRING.cs"
-             Link="Common\Interop\Windows\Interop.UNICODE_STRING.cs" />
+    <Compile Include="System\Net\Mail\SmtpNegotiateAuthenticationModule.cs" />
+    <Compile Include="System\Net\Mail\SmtpNtlmAuthenticationModule.cs" />
   </ItemGroup>
 
   <!-- Unix specific files -->
   <ItemGroup Condition="'$(TargetsUnix)' == 'true'">
     <Compile Include="$(CommonPath)System\Net\ContextAwareResult.Unix.cs"
              Link="Common\System\Net\ContextAwareResult.Unix.cs" />
-    <Compile Include="$(CommonPath)System\Net\ContextFlagsAdapterPal.Unix.cs"
-             Link="Common\System\Net\ContextFlagsAdapterPal.Unix.cs" />
+  </ItemGroup>
+
+  <!-- Unix specific files (NT Authentication) -->
+  <ItemGroup Condition="'$(TargetsUnix)' == 'true' and '$(TargetstvOS)' != 'true'">
     <Compile Include="$(CommonPath)Interop\Unix\Interop.Libraries.cs"
              Link="Common\Interop\Unix\Interop.Libraries.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Net.Security.Native\Interop.GssBuffer.cs"
@@ -149,29 +154,26 @@
              Link="Common\Interop\Unix\System.Net.Security.Native\Interop.NetSecurityNative.Status.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Net.Security.Native\Interop.NetSecurityNative.IsNtlmInstalled.cs"
              Link="Common\Interop\Unix\System.Net.Security.Native\Interop.NetSecurityNative.IsNtlmInstalled.cs" />
-    <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeDeleteNegoContext.cs"
-             Link="Common\System\Net\Security\Unix\SafeDeleteNegoContext.cs" />
-    <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeFreeCredentials.cs"
-             Link="Common\System\Net\Security\Unix\SafeFreeCredentials.cs" />
     <Compile Include="$(CommonPath)Microsoft\Win32\SafeHandles\GssSafeHandles.cs"
              Link="Common\Microsoft\Win32\SafeHandles\GssSafeHandles.cs" />
+    <Compile Include="$(CommonPath)System\Net\ContextFlagsAdapterPal.Unix.cs"
+             Link="Common\System\Net\ContextFlagsAdapterPal.Unix.cs" />
     <Compile Include="$(CommonPath)System\Net\Security\Unix\SecChannelBindings.cs"
              Link="Common\System\Net\Security\Unix\SecChannelBindings.cs" />
-  </ItemGroup>
-  <ItemGroup Condition="'$(TargetsUnix)' == 'true' and '$(TargetstvOS)' != 'true'">
-    <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeFreeNegoCredentials.cs"
-             Link="Common\System\Net\Security\Unix\SafeFreeNegoCredentials.cs" />
     <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeDeleteContext.cs"
              Link="Common\System\Net\Security\Unix\SafeDeleteContext.cs" />
+    <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeDeleteNegoContext.cs"
+             Link="Common\System\Net\Security\Unix\SafeDeleteNegoContext.cs" />
+    <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeFreeCredentials.cs"
+             Link="Common\System\Net\Security\Unix\SafeFreeCredentials.cs" />
+    <Compile Include="$(CommonPath)System\Net\Security\Unix\SafeFreeNegoCredentials.cs"
+             Link="Common\System\Net\Security\Unix\SafeFreeNegoCredentials.cs" />
     <Compile Include="$(CommonPath)System\Net\Security\NegotiateStreamPal.Unix.cs"
              Link="Common\System\Net\Security\NegotiateStreamPal.Unix.cs" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetstvOS)' == 'true'">
-    <Compile Include="$(CommonPath)System\Net\Security\NegotiateStreamPal.PlatformNotSupported.cs"
-             Link="Common\System\Net\Security\NegotiateStreamPal.PlatformNotSupported.cs" />
-  </ItemGroup>
+
   <!-- Windows specific files -->
-  <ItemGroup Condition="'$(TargetsWindows)'=='true'">
+  <ItemGroup Condition="'$(TargetsWindows)' == 'true'">
     <Compile Include="$(CommonPath)System\Net\Security\SecurityBuffer.Windows.cs"
              Link="Common\System\Net\Security\SecurityBuffer.Windows.cs" />
     <Compile Include="$(CommonPath)System\Net\Security\SecurityBufferType.Windows.cs"
@@ -206,6 +208,8 @@
              Link="Common\Interop\Windows\Crypt32\Interop.Interop.MsgEncodingType.cs" />
     <Compile Include="$(CommonPath)Interop\Windows\Interop.BOOL.cs"
              Link="Common\Interop\Windows\Interop.BOOL.cs" />
+    <Compile Include="$(CommonPath)Interop\Windows\Interop.UNICODE_STRING.cs"
+             Link="Common\Interop\Windows\Interop.UNICODE_STRING.cs" />
     <Compile Include="$(CommonPath)Interop\Windows\Interop.Libraries.cs"
              Link="Common\Interop\Windows\Interop.Libraries.cs" />
     <Compile Include="$(CommonPath)Interop\Windows\SspiCli\SecPkgContext_Bindings.cs"
diff --git a/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpAuthenticationManager.cs b/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpAuthenticationManager.cs
index c5c1e4d1416fcf..e9550139b62861 100644
--- a/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpAuthenticationManager.cs
+++ b/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpAuthenticationManager.cs
@@ -11,8 +11,10 @@ internal static class SmtpAuthenticationManager
 
         static SmtpAuthenticationManager()
         {
+#if !NO_NTAUTHENTICATION
             Register(new SmtpNegotiateAuthenticationModule());
             Register(new SmtpNtlmAuthenticationModule());
+#endif
             Register(new SmtpLoginAuthenticationModule());
         }
 
diff --git a/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpConnection.Auth.cs b/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpConnection.Auth.cs
index 0fa1b892fd9a5d..590e84788fdbae 100644
--- a/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpConnection.Auth.cs
+++ b/src/libraries/System.Net.Mail/src/System/Net/Mail/SmtpConnection.Auth.cs
@@ -18,7 +18,9 @@ internal sealed partial class SmtpConnection
 #pragma warning disable CS0414      // Field is not used in test project
         private bool _serverSupportsStartTls;
 #pragma warning restore CS0414
+#if !NO_NTAUTHENTICATION
         private bool _sawNegotiate;
+#endif
         private SupportedAuth _supportedAuth = SupportedAuth.None;
         private readonly ISmtpAuthenticationModule[] _authenticationModules;
 
@@ -91,6 +93,7 @@ internal bool AuthSupported(ISmtpAuthenticationModule module)
                     return true;
                 }
             }
+#if !NO_NTAUTHENTICATION
             else if (module is SmtpNegotiateAuthenticationModule)
             {
                 if ((_supportedAuth & SupportedAuth.GSSAPI) > 0)
@@ -107,6 +110,7 @@ internal bool AuthSupported(ISmtpAuthenticationModule module)
                     return true;
                 }
             }
+#endif
 
             return false;
         }