diff --git a/index.php b/index.php
index 5bd2a78..a996d60 100644
--- a/index.php
+++ b/index.php
@@ -347,13 +347,13 @@
 				die();
 			}
 
+			//	Validate HTTP Message Signature
+			if ( !verifyHTTPSignature() ) { die(); }
+
 			//	If this is an Undo, Delete, or Update message, try to process it
 			if ( "Undo" == $inbox_type || "Delete" == $inbox_type || "Update" == $inbox_type ) { 
 				undo( $inbox_message ); 
 			}
-
-			//	Validate HTTP Message Signature
-			if ( !verifyHTTPSignature() ) { die(); }
 		}
 		
 		//	If the message is valid, save the message in `/data/inbox/`
@@ -1749,9 +1749,6 @@ HTML;
 	//	Perform the Undo action requested
 	function undo( $message ) { 
 		global $server, $directories;
-		
-		//	Validate HTTP Message Signature
-		if ( !verifyHTTPSignature() ) { die(); }
 
 		//	Get some basic data
 		$type = $message["type"];