diff --git a/Src/Exchange.DkimSigner/DkimSigner.cs b/Src/Exchange.DkimSigner/DkimSigner.cs
index 3dbcf3dd..bbdddb15 100644
--- a/Src/Exchange.DkimSigner/DkimSigner.cs
+++ b/Src/Exchange.DkimSigner/DkimSigner.cs
@@ -18,11 +18,6 @@ namespace Exchange.DkimSigner
     public class DkimSigner
     {
 
-        /// <summary>
-        /// A value indicating whether or not the instance of the signer has been disposed.
-        /// </summary>
-        private bool disposed;
-
         /// <summary>
         /// The headers that should be a part of the DKIM signature, if present in the message.
         /// </summary>
@@ -183,9 +178,6 @@ public Dictionary<string, DomainElementSigner> GetDomains()
         /// <returns></returns>
         public void SignMessage(DomainElementSigner domainSigner, MailItem mailItem)
         {
-            if (disposed)
-                throw new ObjectDisposedException("DkimSigner");
-
             using (Stream stream = mailItem.GetMimeReadStream())
             {
                 stream.Seek(0, SeekOrigin.Begin);