diff --git a/Test/Altinn.Correspondence.Tests/CorrespondenceControllerTests.cs b/Test/Altinn.Correspondence.Tests/CorrespondenceControllerTests.cs
index c73de4d8..c6b9e1fd 100644
--- a/Test/Altinn.Correspondence.Tests/CorrespondenceControllerTests.cs
+++ b/Test/Altinn.Correspondence.Tests/CorrespondenceControllerTests.cs
@@ -108,6 +108,79 @@ public async Task InitializeCorrespondence_With_Invalid_Recipient_Returns_BadReq
         Assert.Equal(HttpStatusCode.BadRequest, initializeCorrespondenceResponse.StatusCode);
     }
 
+    [Fact]
+    public async Task InitializeCorrespondence_DueDate_PriorToday_Returns_BadRequest()
+    {
+        // Arrange
+        var correspondence = InitializeCorrespondenceFactory.BasicCorrespondences();
+        correspondence.Correspondence.DueDateTime = DateTimeOffset.Now.AddDays(-7);
+
+        // Act
+        var initializeCorrespondenceResponse = await _client.PostAsJsonAsync("correspondence/api/v1/correspondence", correspondence);
+
+        // Assert
+        Assert.Equal(HttpStatusCode.BadRequest, initializeCorrespondenceResponse.StatusCode);
+    }
+    [Fact]
+    public async Task InitializeCorrespondence_DueDate_PriorVisibleFrom_Returns_BadRequest()
+    {
+        // Arrange
+        var correspondence = InitializeCorrespondenceFactory.BasicCorrespondences();
+        correspondence.Correspondence.DueDateTime = DateTimeOffset.Now.AddDays(7);
+        correspondence.Correspondence.VisibleFrom = DateTimeOffset.Now.AddDays(14);
+
+        // Act
+        var initializeCorrespondenceResponse = await _client.PostAsJsonAsync("correspondence/api/v1/correspondence", correspondence);
+
+        // Assert
+        Assert.Equal(HttpStatusCode.BadRequest, initializeCorrespondenceResponse.StatusCode);
+    }
+
+    [Fact]
+    public async Task InitializeCorrespondence_AllowSystemDeleteAfter_PriorToday_Returns_BadRequest()
+    {
+        // Arrange
+        var correspondence = InitializeCorrespondenceFactory.BasicCorrespondences();
+        correspondence.Correspondence.AllowSystemDeleteAfter = DateTimeOffset.Now.AddDays(-7);
+
+        // Act
+        var initializeCorrespondenceResponse = await _client.PostAsJsonAsync("correspondence/api/v1/correspondence", correspondence);
+
+        // Assert
+        Assert.Equal(HttpStatusCode.BadRequest, initializeCorrespondenceResponse.StatusCode);
+    }
+
+    [Fact]
+    public async Task InitializeCorrespondence_AllowSystemDeleteAfter_PriorVisibleFrom_Returns_BadRequest()
+    {
+        // Arrange
+        var correspondence = InitializeCorrespondenceFactory.BasicCorrespondences();
+        correspondence.Correspondence.VisibleFrom = DateTimeOffset.Now.AddDays(14);
+        correspondence.Correspondence.DueDateTime = DateTimeOffset.Now.AddDays(21); // ensure DueDate is after VisibleFrom
+        correspondence.Correspondence.AllowSystemDeleteAfter = DateTimeOffset.Now.AddDays(7);
+
+        // Act
+        var initializeCorrespondenceResponse = await _client.PostAsJsonAsync("correspondence/api/v1/correspondence", correspondence);
+
+        // Assert
+        Assert.Equal(HttpStatusCode.BadRequest, initializeCorrespondenceResponse.StatusCode);
+    }
+    [Fact]
+    public async Task InitializeCorrespondence_AllowSystemDeleteAfter_PriorDueDate_Returns_BadRequest()
+    {
+        // Arrange
+        var correspondence = InitializeCorrespondenceFactory.BasicCorrespondences();
+        correspondence.Correspondence.VisibleFrom = DateTimeOffset.Now.AddDays(7);
+        correspondence.Correspondence.AllowSystemDeleteAfter = DateTimeOffset.Now.AddDays(14);
+        correspondence.Correspondence.DueDateTime = DateTimeOffset.Now.AddDays(21);
+
+        // Act
+        var initializeCorrespondenceResponse = await _client.PostAsJsonAsync("correspondence/api/v1/correspondence", correspondence);
+
+        // Assert
+        Assert.Equal(HttpStatusCode.BadRequest, initializeCorrespondenceResponse.StatusCode);
+    }
+
     [Fact]
     public async Task UploadCorrespondence_Gives_Ok()
     {
@@ -130,7 +203,7 @@ public async Task UploadCorrespondence_Gives_Ok()
             using var fileStream = file.OpenReadStream();
             formData.Add(new StreamContent(fileStream), "attachments", file.FileName);
             var uploadCorrespondenceResponse = await _client.PostAsync("correspondence/api/v1/correspondence/upload", formData);
-            uploadCorrespondenceResponse.EnsureSuccessStatusCode();
+            Assert.True(uploadCorrespondenceResponse.IsSuccessStatusCode, await uploadCorrespondenceResponse.Content.ReadAsStringAsync());
 
             var response = await uploadCorrespondenceResponse.Content.ReadFromJsonAsync<InitializeCorrespondencesResponseExt>(_responseSerializerOptions);
             var attachmentId = response?.AttachmentIds.FirstOrDefault();
@@ -523,6 +596,7 @@ private MultipartFormDataContent CorrespondenceToFormData(BaseCorrespondenceExt
             { new StringContent(correspondence.Sender), "correspondence.sender" },
             { new StringContent(correspondence.SendersReference), "correspondence.sendersReference" },
             { new StringContent(correspondence.VisibleFrom.ToString()), "correspondence.visibleFrom" },
+            { new StringContent(correspondence.DueDateTime.ToString()), "correspondence.dueDateTime" },
             { new StringContent(correspondence.AllowSystemDeleteAfter.ToString()), "correspondence.AllowSystemDeleteAfter" },
             { new StringContent(correspondence.Content.MessageTitle), "correspondence.content.MessageTitle" },
             { new StringContent(correspondence.Content.MessageSummary), "correspondence.content.MessageSummary" },
diff --git a/Test/Altinn.Correspondence.Tests/Factories/InitializeCorrespondenceFactory.cs b/Test/Altinn.Correspondence.Tests/Factories/InitializeCorrespondenceFactory.cs
index 9105749d..be588b58 100644
--- a/Test/Altinn.Correspondence.Tests/Factories/InitializeCorrespondenceFactory.cs
+++ b/Test/Altinn.Correspondence.Tests/Factories/InitializeCorrespondenceFactory.cs
@@ -29,9 +29,9 @@ internal static class InitializeCorrespondenceFactory
                     }
                 },
             },
-            VisibleFrom = DateTime.UtcNow,
-            AllowSystemDeleteAfter = DateTime.UtcNow.AddDays(3),
-            DueDateTime = DateTime.UtcNow.AddDays(2),
+            VisibleFrom = DateTimeOffset.UtcNow,
+            AllowSystemDeleteAfter = DateTimeOffset.UtcNow.AddDays(3),
+            DueDateTime= DateTimeOffset.UtcNow.AddDays(2),
             ExternalReferences = new List<ExternalReferenceExt>(){
                 new ExternalReferenceExt()
                 {
diff --git a/src/Altinn.Correspondence.Application/Errors.cs b/src/Altinn.Correspondence.Application/Errors.cs
index b099f5db..91d950c6 100644
--- a/src/Altinn.Correspondence.Application/Errors.cs
+++ b/src/Altinn.Correspondence.Application/Errors.cs
@@ -31,4 +31,9 @@ public static class Errors
     public static Error HashError = new Error(23, "Checksum mismatch", HttpStatusCode.BadRequest);
     public static Error DataLocationNotFound = new Error(24, "Could not get data location url", HttpStatusCode.BadRequest);
     public static Error ExistingAttachmentNotFound = new Error(25, "Existing attachment not found", HttpStatusCode.BadRequest);
+    public static Error DueDatePriorToday = new Error(26, "DueDateTime cannot be prior to today", HttpStatusCode.BadRequest);
+    public static Error DueDatePriorVisibleFrom = new Error(27, "DueDateTime cannot be prior to VisibleFrom", HttpStatusCode.BadRequest);
+    public static Error AllowSystemDeletePriorToday = new Error(28, "AllowSystemDelete cannot be prior to today", HttpStatusCode.BadRequest);
+    public static Error AllowSystemDeletePriorVisibleFrom = new Error(29, "AllowSystemDelete cannot be prior to VisibleFrom", HttpStatusCode.BadRequest);
+    public static Error AllowSystemDeletePriorDueDate = new Error(30, "AllowSystemDelete cannot be prior to DueDateTime", HttpStatusCode.BadRequest);
 }
diff --git a/src/Altinn.Correspondence.Application/Helpers/InitializeCorrespondenceHelper.cs b/src/Altinn.Correspondence.Application/Helpers/InitializeCorrespondenceHelper.cs
index 12412ec6..0826b96a 100644
--- a/src/Altinn.Correspondence.Application/Helpers/InitializeCorrespondenceHelper.cs
+++ b/src/Altinn.Correspondence.Application/Helpers/InitializeCorrespondenceHelper.cs
@@ -22,6 +22,31 @@ public InitializeCorrespondenceHelper(IAttachmentRepository attachmentRepository
             _uploadHelper = uploadHelper;
 
         }
+        public Error? ValidateDateConstraints(CorrespondenceEntity correspondence)
+        {
+            var visibleFrom = correspondence.VisibleFrom;
+            if (correspondence.DueDateTime < DateTimeOffset.Now)
+            {
+                return Errors.DueDatePriorToday;
+            }
+            if (correspondence.DueDateTime < visibleFrom)
+            {
+                return Errors.DueDatePriorVisibleFrom;
+            }
+            if (correspondence.AllowSystemDeleteAfter < DateTimeOffset.Now)
+            {
+                return Errors.AllowSystemDeletePriorToday;
+            }
+            if (correspondence.AllowSystemDeleteAfter < visibleFrom)
+            {
+                return Errors.AllowSystemDeletePriorVisibleFrom;
+            }
+            if (correspondence.AllowSystemDeleteAfter < correspondence.DueDateTime)
+            {
+                return Errors.AllowSystemDeletePriorDueDate;
+            }
+            return null;
+        }
         public Error? ValidateCorrespondenceContent(CorrespondenceContentEntity content)
         {
             if (!TextValidation.ValidatePlainText(content?.MessageTitle))
diff --git a/src/Altinn.Correspondence.Application/InitializeCorrespondences/InitializeCorrespondencesHandler.cs b/src/Altinn.Correspondence.Application/InitializeCorrespondences/InitializeCorrespondencesHandler.cs
index cfaa49b1..816e6025 100644
--- a/src/Altinn.Correspondence.Application/InitializeCorrespondences/InitializeCorrespondencesHandler.cs
+++ b/src/Altinn.Correspondence.Application/InitializeCorrespondences/InitializeCorrespondencesHandler.cs
@@ -46,6 +46,11 @@ public async Task<OneOf<InitializeCorrespondencesResponse, Error>> Process(Initi
         {
             return Errors.DuplicateRecipients;
         }
+        var dateError = _initializeCorrespondenceHelper.ValidateDateConstraints(request.Correspondence);
+        if (dateError != null)
+        {
+            return dateError;
+        }
         var contentError = _initializeCorrespondenceHelper.ValidateCorrespondenceContent(request.Correspondence.Content);
         if (contentError != null)
         {