diff --git a/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe b/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe
index 6b9e1051..6ea582e5 100644
Binary files a/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe and b/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe differ
diff --git a/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe.config b/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe.config
index bce633a5..2799e3e0 100644
--- a/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe.config
+++ b/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.exe.config
@@ -1,6 +1,18 @@
 <?xml version="1.0"?>
 <configuration>
+  <configSections>
+    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
+      <section name="Configuration.DkimSigner.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
+    </sectionGroup>
+  </configSections>
   <startup useLegacyV2RuntimeActivationPolicy="true">
     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
   </startup>
+  <userSettings>
+    <Configuration.DkimSigner.Settings>
+      <setting name="KeyLength" serializeAs="String">
+        <value>2048</value>
+      </setting>
+    </Configuration.DkimSigner.Settings>
+  </userSettings>
 </configuration>
diff --git a/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.pdb b/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.pdb
index cad5ed22..b284e6af 100644
Binary files a/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.pdb and b/Src/Configuration.DkimSigner/bin/Release/Configuration.DkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.dll
index bbff31c8..b871a5c1 100755
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.pdb
index 76bee281..98416046 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2007 SP3/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.dll
index ebcb1552..94f5cb37 100755
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.pdb
index f91f4c77..52d197b4 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP1/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.dll
index 8bec9c1c..d7a75219 100755
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.pdb
index e1be6939..53f4ecdd 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP2/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.dll
index 6d105d93..b14eeade 100755
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.pdb
index 2554f6fe..8da3a23c 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2010 SP3/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.dll
index 3d3fa994..32058f57 100755
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.pdb
index 9bba9184..006740f6 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2010/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll
index 2f29c3e6..1ef95b22 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.pdb
index 88eae4a0..c511eea9 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU1/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll
index b9078724..59e247ad 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.pdb
index 56a9a14f..5c58864a 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU2/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll
index bde7097f..7c6fb1bc 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.pdb
index a28609f5..f538d22a 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013 CU3/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll
index adda38cc..a5833fce 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.pdb
index 22b66ef3..7ebf1764 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU4/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll
index cc916087..012a7ceb 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.pdb
index 84e6af96..d078c392 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU5/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll
index 18c10e80..c7d9dad2 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.pdb
index 72464f98..f0a8d400 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU6/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.dll
new file mode 100644
index 00000000..7b2556f2
Binary files /dev/null and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.dll.config
new file mode 100644
index 00000000..4535d653
--- /dev/null
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.dll.config	
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
+</configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.pdb
new file mode 100644
index 00000000..3f204238
Binary files /dev/null and b/Src/Exchange.DkimSigner/bin/Exchange 2013 SP1 CU7/ExchangeDkimSigner.pdb differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll b/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll
index 4600fd09..bbda4942 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll and b/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll differ
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll.config b/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll.config
index bd80214e..4535d653 100644
--- a/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll.config	
+++ b/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.dll.config	
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-  <startup>
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
-  </startup>
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+  </startup>
 </configuration>
\ No newline at end of file
diff --git a/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.pdb b/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.pdb
index 36e6472e..ce6566f7 100644
Binary files a/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.pdb and b/Src/Exchange.DkimSigner/bin/Exchange 2013/ExchangeDkimSigner.pdb differ