diff --git a/EnvelopeGenerator.Domain/Entities/Receiver.cs b/EnvelopeGenerator.Domain/Entities/Receiver.cs
index 6e45fc3b..9c69c94a 100644
--- a/EnvelopeGenerator.Domain/Entities/Receiver.cs
+++ b/EnvelopeGenerator.Domain/Entities/Receiver.cs
@@ -1,7 +1,6 @@
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Drawing;
-using DigitalData.Modules.Base;
 #if NETFRAMEWORK
 using System;
 using System.Collections.Generic;
@@ -80,11 +79,11 @@ namespace EnvelopeGenerator.Domain.Entities
             SignedDate == DateTime.MinValue ? "-" : SignedDate.ToString("G");
 
         [NotMapped]
-        public Color Color => Helpers.ColorTypeToColor(ColorType);
+        public Color Color => ColorType.ToColor();
 
         public string GetSignature()
         {
-            return StringEx.GetChecksum(EmailAddress?.ToUpperInvariant() ?? string.Empty);
+            return EmailAddress.ToUpperInvariant().GetChecksum();
         }
     }
 }
\ No newline at end of file
diff --git a/EnvelopeGenerator.Domain/EnvelopeGenerator.Domain.csproj b/EnvelopeGenerator.Domain/EnvelopeGenerator.Domain.csproj
index 3b76d5b8..83410283 100644
--- a/EnvelopeGenerator.Domain/EnvelopeGenerator.Domain.csproj
+++ b/EnvelopeGenerator.Domain/EnvelopeGenerator.Domain.csproj
@@ -20,7 +20,6 @@
 
   <ItemGroup>
     <PackageReference Include="DigitalData.EmailProfilerDispatcher.Abstraction.Attributes" Version="1.0.0" />
-    <PackageReference Include="DigitalData.Modules.Base" Version="1.3.8" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/EnvelopeGenerator.Domain/Helpers.cs b/EnvelopeGenerator.Domain/Helpers.cs
new file mode 100644
index 00000000..bb18dc58
--- /dev/null
+++ b/EnvelopeGenerator.Domain/Helpers.cs
@@ -0,0 +1,48 @@
+using System.Drawing;
+using System.Text;
+using System.Security.Cryptography;
+#if NETFRAMEWORK
+using System;
+#endif
+
+namespace EnvelopeGenerator.Domain
+{
+    public static class Helpers
+    {
+        public static Color ToColor(this Constants.ColorType pColorType)
+        {
+            switch (pColorType)
+            {
+                case Constants.ColorType.ReceiverColor1:
+                    return ColorTranslator.FromHtml("#22c55e");
+                case Constants.ColorType.ReceiverColor2:
+                    return ColorTranslator.FromHtml("#3b82f6");
+                case Constants.ColorType.ReceiverColor3:
+                    return ColorTranslator.FromHtml("#8b5cf6");
+                case Constants.ColorType.ReceiverColor4:
+                    return ColorTranslator.FromHtml("#f59e0b");
+                case Constants.ColorType.ReceiverColor5:
+                    return ColorTranslator.FromHtml("#ef4444");
+                case Constants.ColorType.ReceiverColor6:
+                    return ColorTranslator.FromHtml("#14b8a6");
+                case Constants.ColorType.ReceiverColor7:
+                    return ColorTranslator.FromHtml("#d946ef");
+                case Constants.ColorType.ReceiverColor8:
+                    return ColorTranslator.FromHtml("#06b6d4");
+                case Constants.ColorType.ReceiverColor9:
+                    return ColorTranslator.FromHtml("#10b981");
+                case Constants.ColorType.ReceiverColor10:
+                    return ColorTranslator.FromHtml("#84cc16");
+                default:
+                    return Color.Empty;
+            }
+        }
+
+        public static string GetChecksum(this string pStringToCheck)
+        {
+            byte[] bytes = Encoding.UTF8.GetBytes(pStringToCheck);
+            byte[] pChecksum = SHA256.Create().ComputeHash(bytes);
+            return BitConverter.ToString(pChecksum).Replace("-", "").ToLowerInvariant();
+        }
+    }
+}