diff --git a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt
index 5a4bad06a..ff3824f48 100644
--- a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt
+++ b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt
@@ -4218,6 +4218,7 @@ Octopus.Client.Model
     String SmtpLogin { get; set; }
     Octopus.Client.Model.SensitiveValue SmtpPassword { get; set; }
     Nullable<Int32> SmtpPort { get; set; }
+    Nullable<Int32> Timeout { get; set; }
   }
   class SpaceResource
     Octopus.Client.Extensibility.IResource
diff --git a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt
index 0a12cbfec..78418ea49 100644
--- a/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt
+++ b/source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETFramework.approved.txt
@@ -4238,6 +4238,7 @@ Octopus.Client.Model
     String SmtpLogin { get; set; }
     Octopus.Client.Model.SensitiveValue SmtpPassword { get; set; }
     Nullable<Int32> SmtpPort { get; set; }
+    Nullable<Int32> Timeout { get; set; }
   }
   class SpaceResource
     Octopus.Client.Extensibility.IResource
diff --git a/source/Octopus.Client/Model/SmtpConfigurationResource.cs b/source/Octopus.Client/Model/SmtpConfigurationResource.cs
index fccff0b36..718ff3dd8 100644
--- a/source/Octopus.Client/Model/SmtpConfigurationResource.cs
+++ b/source/Octopus.Client/Model/SmtpConfigurationResource.cs
@@ -20,6 +20,9 @@ public class SmtpConfigurationResource : Resource
 
         [Writeable]
         public bool EnableSsl { get; set; }
+        
+        [Writeable]
+        public int? Timeout { get; set; }
 
         [Writeable]
         public SensitiveValue SmtpPassword { get; set; }