diff --git a/NAPS2.Lib.Common/Config/CommonConfig.cs b/NAPS2.Lib.Common/Config/CommonConfig.cs
index cc6f67cf3..e0d6898b4 100644
--- a/NAPS2.Lib.Common/Config/CommonConfig.cs
+++ b/NAPS2.Lib.Common/Config/CommonConfig.cs
@@ -167,10 +167,6 @@ public class CommonConfig
     [Common]
     public KeyboardShortcuts KeyboardShortcuts { get; set; } = new KeyboardShortcuts();
 
-    [Config]
-    [Common]
-    public SslSetup SslSetup { get; set; } = new SslSetup();
-
     [Common]
     public ScanProfile? DefaultProfileSettings { get; set; }
 }
\ No newline at end of file
diff --git a/NAPS2.Lib.Common/Config/FileConfigScope.cs b/NAPS2.Lib.Common/Config/FileConfigScope.cs
index 45dfa1fa3..69175930d 100644
--- a/NAPS2.Lib.Common/Config/FileConfigScope.cs
+++ b/NAPS2.Lib.Common/Config/FileConfigScope.cs
@@ -34,7 +34,6 @@ public class FileConfigScope<TConfig> : ConfigScope<TConfig>
 
     protected override void SetInternal<T>(Expression<Func<TConfig, T>> accessor, T value)
     {
-        // TODO: As we got rid of SetAll, replace it with something that allows multiple writes before flushing to disk
         _changes.Set(accessor, value);
         WriteHandshake();
     }
diff --git a/NAPS2.Lib.Common/Config/InternalDefaults.cs b/NAPS2.Lib.Common/Config/InternalDefaults.cs
index ac498e2d6..94e41a670 100644
--- a/NAPS2.Lib.Common/Config/InternalDefaults.cs
+++ b/NAPS2.Lib.Common/Config/InternalDefaults.cs
@@ -180,11 +180,6 @@ public static class InternalDefaults
                 ZoomIn = "Ctrl+Oemplus",
                 ZoomOut = "Ctrl+OemMinus"
             },
-            SslSetup = new SslSetup
-            {
-                WorkerCert = "",
-                WorkerPrivateKey = ""
-            },
             DefaultProfileSettings = new ScanProfile { Version = ScanProfile.CURRENT_VERSION }
         };
 }
\ No newline at end of file
diff --git a/NAPS2.Lib.Common/Config/SslSetup.cs b/NAPS2.Lib.Common/Config/SslSetup.cs
deleted file mode 100644
index 75b1f63ff..000000000
--- a/NAPS2.Lib.Common/Config/SslSetup.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using NAPS2.Serialization;
-
-namespace NAPS2.Config;
-
-public class SslSetup
-{
-    public SecureString? WorkerCert { get; set; }
-        
-    public SecureString? WorkerPrivateKey { get; set; }
-}
\ No newline at end of file
diff --git a/NAPS2.Lib.WinForms/WinForms/FPdfSettings.cs b/NAPS2.Lib.WinForms/WinForms/FPdfSettings.cs
index ac73bcb57..2b409f118 100644
--- a/NAPS2.Lib.WinForms/WinForms/FPdfSettings.cs
+++ b/NAPS2.Lib.WinForms/WinForms/FPdfSettings.cs
@@ -76,14 +76,14 @@ public partial class FPdfSettings : FormBase
         {
             DefaultFileName = txtDefaultFilePath.Text,
             SkipSavePrompt = cbSkipSavePrompt.Checked,
-            Metadata =
+            Metadata = new PdfMetadata
             {
                 Title = txtTitle.Text,
                 Author = txtAuthor.Text,
                 Subject = txtSubject.Text,
                 Keywords = txtKeywords.Text
             },
-            Encryption =
+            Encryption = new PdfEncryption
             {
                 EncryptPdf = cbEncryptPdf.Checked,
                 OwnerPassword = txtOwnerPassword.Text,
diff --git a/NAPS2.Sdk/ImportExport/Email/EmailSettings.cs b/NAPS2.Sdk/ImportExport/Email/EmailSettings.cs
index 0f433149c..b5bae5ea5 100644
--- a/NAPS2.Sdk/ImportExport/Email/EmailSettings.cs
+++ b/NAPS2.Sdk/ImportExport/Email/EmailSettings.cs
@@ -1,6 +1,6 @@
 namespace NAPS2.ImportExport.Email;
 
-public class EmailSettings
+public record EmailSettings
 {
-    public string? AttachmentName { get; set; }
+    public string AttachmentName { get; init; } = "Scan.pdf";
 }
\ No newline at end of file
diff --git a/NAPS2.Sdk/ImportExport/Email/Mapi/IMapiWrapper.cs b/NAPS2.Sdk/ImportExport/Email/Mapi/IMapiWrapper.cs
index 447f5a78a..c3cfbd356 100644
--- a/NAPS2.Sdk/ImportExport/Email/Mapi/IMapiWrapper.cs
+++ b/NAPS2.Sdk/ImportExport/Email/Mapi/IMapiWrapper.cs
@@ -2,7 +2,7 @@
 
 public interface IMapiWrapper
 {
-    bool CanLoadClient(string clientName);
+    bool CanLoadClient(string? clientName);
 
-    Task<MapiSendMailReturnCode> SendEmail(string clientName, EmailMessage message);
+    Task<MapiSendMailReturnCode> SendEmail(string? clientName, EmailMessage message);
 }
\ No newline at end of file
diff --git a/NAPS2.Sdk/ImportExport/Email/Mapi/MapiDispatcher.cs b/NAPS2.Sdk/ImportExport/Email/Mapi/MapiDispatcher.cs
index 461612787..c71f13221 100644
--- a/NAPS2.Sdk/ImportExport/Email/Mapi/MapiDispatcher.cs
+++ b/NAPS2.Sdk/ImportExport/Email/Mapi/MapiDispatcher.cs
@@ -26,7 +26,7 @@ public class MapiDispatcher
     /// <param name="clientName">The MAPI client name.</param>
     /// <param name="message">The object describing the email message.</param>
     /// <returns>The MAPI return code.</returns>
-    public async Task<MapiSendMailReturnCode> SendEmail(string clientName, EmailMessage message)
+    public async Task<MapiSendMailReturnCode> SendEmail(string? clientName, EmailMessage message)
     {
         if (UseWorker && !_mapiWrapper.CanLoadClient(clientName))
         {
diff --git a/NAPS2.Sdk/ImportExport/Email/Mapi/SystemEmailClients.cs b/NAPS2.Sdk/ImportExport/Email/Mapi/SystemEmailClients.cs
index 69ad448f8..e7b1727d0 100644
--- a/NAPS2.Sdk/ImportExport/Email/Mapi/SystemEmailClients.cs
+++ b/NAPS2.Sdk/ImportExport/Email/Mapi/SystemEmailClients.cs
@@ -70,7 +70,7 @@ public class SystemEmailClients
 
     private static string GetDllPath(string? clientName)
     {
-        if (clientName == null)
+        if (string.IsNullOrEmpty(clientName))
         {
             return DEFAULT_MAPI_DLL;
         }
diff --git a/NAPS2.Sdk/ImportExport/Images/ImageSettings.cs b/NAPS2.Sdk/ImportExport/Images/ImageSettings.cs
index 370b6ede0..4d42f3723 100644
--- a/NAPS2.Sdk/ImportExport/Images/ImageSettings.cs
+++ b/NAPS2.Sdk/ImportExport/Images/ImageSettings.cs
@@ -1,14 +1,14 @@
 namespace NAPS2.ImportExport.Images;
 
-public class ImageSettings
+public record ImageSettings
 {
-    public string? DefaultFileName { get; set; }
+    public string? DefaultFileName { get; init; }
 
-    public bool SkipSavePrompt { get; set; }
+    public bool SkipSavePrompt { get; init; }
 
-    public int JpegQuality { get; set; }
+    public int JpegQuality { get; init; } = 75;
 
-    public TiffCompression TiffCompression { get; set; }
+    public TiffCompression TiffCompression { get; init; } = TiffCompression.Auto;
 
-    public bool SinglePageTiff { get; set; }
+    public bool SinglePageTiff { get; init; }
 }
\ No newline at end of file
diff --git a/NAPS2.Sdk/ImportExport/Pdf/PdfEncryption.cs b/NAPS2.Sdk/ImportExport/Pdf/PdfEncryption.cs
index 07986ea63..fb6f9d50f 100644
--- a/NAPS2.Sdk/ImportExport/Pdf/PdfEncryption.cs
+++ b/NAPS2.Sdk/ImportExport/Pdf/PdfEncryption.cs
@@ -1,16 +1,16 @@
 namespace NAPS2.ImportExport.Pdf;
 
-public class PdfEncryption
+public record PdfEncryption
 {
-    public bool EncryptPdf { get; set; }
-    public string? UserPassword { get; set; }
-    public string? OwnerPassword { get; set; }
-    public bool AllowContentCopyingForAccessibility { get; set; } = true;
-    public bool AllowAnnotations { get; set; } = true;
-    public bool AllowDocumentAssembly { get; set; } = true;
-    public bool AllowContentCopying { get; set; } = true;
-    public bool AllowFormFilling { get; set; } = true;
-    public bool AllowFullQualityPrinting { get; set; } = true;
-    public bool AllowDocumentModification { get; set; } = true;
-    public bool AllowPrinting { get; set; } = true;
+    public bool EncryptPdf { get; init; }
+    public string? UserPassword { get; init; }
+    public string? OwnerPassword { get; init; }
+    public bool AllowContentCopyingForAccessibility { get; init; } = true;
+    public bool AllowAnnotations { get; init; } = true;
+    public bool AllowDocumentAssembly { get; init; } = true;
+    public bool AllowContentCopying { get; init; } = true;
+    public bool AllowFormFilling { get; init; } = true;
+    public bool AllowFullQualityPrinting { get; init; } = true;
+    public bool AllowDocumentModification { get; init; } = true;
+    public bool AllowPrinting { get; init; } = true;
 }
\ No newline at end of file
diff --git a/NAPS2.Sdk/ImportExport/Pdf/PdfExportParams.cs b/NAPS2.Sdk/ImportExport/Pdf/PdfExportParams.cs
index f5b6ec7f0..1dbeecad4 100644
--- a/NAPS2.Sdk/ImportExport/Pdf/PdfExportParams.cs
+++ b/NAPS2.Sdk/ImportExport/Pdf/PdfExportParams.cs
@@ -1,3 +1,21 @@
 namespace NAPS2.ImportExport.Pdf;
 
-public record PdfExportParams(PdfMetadata? Metadata = null, PdfEncryption? Encryption = null, PdfCompat Compat = PdfCompat.Default);
\ No newline at end of file
+public record PdfExportParams
+{
+    public PdfExportParams()
+    {
+    }
+
+    public PdfExportParams(PdfMetadata metadata, PdfEncryption encryption, PdfCompat compat)
+    {
+        Metadata = metadata;
+        Encryption = encryption;
+        Compat = compat;
+    }
+
+    public PdfMetadata Metadata { get; init; } = new();
+
+    public PdfEncryption Encryption { get; init; } = new();
+    
+    public PdfCompat Compat { get; init; } = PdfCompat.Default;
+}
\ No newline at end of file
diff --git a/NAPS2.Sdk/ImportExport/Pdf/PdfMetadata.cs b/NAPS2.Sdk/ImportExport/Pdf/PdfMetadata.cs
index a9ee35977..7ae003da0 100644
--- a/NAPS2.Sdk/ImportExport/Pdf/PdfMetadata.cs
+++ b/NAPS2.Sdk/ImportExport/Pdf/PdfMetadata.cs
@@ -1,10 +1,10 @@
 namespace NAPS2.ImportExport.Pdf;
 
-public class PdfMetadata
+public record PdfMetadata
 {
-    public string? Author { get; set; }
-    public string? Creator { get; set; }
-    public string? Keywords { get; set; }
-    public string? Subject { get; set; }
-    public string? Title { get; set; }
+    public string Author { get; init; } = "";
+    public string Creator { get; init; } = "";
+    public string Keywords { get; init; } = "";
+    public string Subject { get; init; } = "";
+    public string Title { get; init; } = "";
 }
\ No newline at end of file
diff --git a/NAPS2.Sdk/Remoting/Worker/WorkerServiceAdapter.cs b/NAPS2.Sdk/Remoting/Worker/WorkerServiceAdapter.cs
index 640bebe05..4af760b82 100644
--- a/NAPS2.Sdk/Remoting/Worker/WorkerServiceAdapter.cs
+++ b/NAPS2.Sdk/Remoting/Worker/WorkerServiceAdapter.cs
@@ -72,7 +72,7 @@ public class WorkerServiceAdapter
         }
     }
 
-    public async Task<MapiSendMailReturnCode> SendMapiEmail(string clientName, EmailMessage message)
+    public async Task<MapiSendMailReturnCode> SendMapiEmail(string? clientName, EmailMessage message)
     {
         var req = new SendMapiEmailRequest { ClientName = clientName, EmailMessageXml = message.ToXml() };
         var resp = await _client.SendMapiEmailAsync(req);