diff --git a/src/XstReader.Api/XstMessage.cs b/src/XstReader.Api/XstMessage.cs
index 4b4be59..89dd8ca 100644
--- a/src/XstReader.Api/XstMessage.cs
+++ b/src/XstReader.Api/XstMessage.cs
@@ -642,20 +642,31 @@ private void ReadSignedOrEncryptedMessage(byte[] messageBytes)
             }
             else
             {
-                string decryptedMessage = Crypto.DecryptWithCert(messageBytes);
-                string cleartextMessage;
-
-                //Message is only signed
-                if (decryptedMessage.Contains("filename=smime.p7m"))
+                try
                 {
-                    cleartextMessage = Crypto.DecodeSigned(decryptedMessage);
+                    string decryptedMessage = Crypto.DecryptWithCert(messageBytes);
+                    string cleartextMessage;
+
+                    //Message is only signed
+                    if (decryptedMessage.Contains("filename=smime.p7m"))
+                    {
+                        cleartextMessage = Crypto.DecodeSigned(decryptedMessage);
+                    }
+                    // message is only encrypted not signed
+                    else
+                    {
+                        cleartextMessage = decryptedMessage;
+                    }
+                    ParseMimeMessage(cleartextMessage);
                 }
-                // message is only encrypted not signed
-                else
+                catch (Exception ex)
                 {
-                    cleartextMessage = decryptedMessage;
-                }
-                ParseMimeMessage(cleartextMessage);
+                    if (!Environment.GetCommandLineArgs().Contains("--suppressCryptoErrors"))
+                    {
+                        throw ex;
+                    }
+                    System.Diagnostics.Debug.WriteLine(ex);
+                };
             }
 
             //remove P7M encrypted file from attachments list