diff --git a/inc/schedule-functions.php b/inc/schedule-functions.php
index fcada0f2..35091ed2 100644
--- a/inc/schedule-functions.php
+++ b/inc/schedule-functions.php
@@ -73,6 +73,7 @@ function doItipAttendeeReply( vCalendar $resource, $partstat ) {
   
   if ( !$organizer_principal->Exists() ) {
     dbg_error_log( 'schedule', 'Unknown ORGANIZER "%s" - unable to notify.', $organizer->Value() );
+    header( "Debug: Could maybe do the iMIP message dance for organizer ". $organizer->Value() );
     return true;
   }
 
@@ -175,6 +176,9 @@ function doItipAttendeeReply( vCalendar $resource, $partstat ) {
         $attendee_inbox->WriteCalendarMember($schedule_request, false);
       }
     }
+    else {
+      header( "Debug: Could maybe do the iMIP message dance for attendee ". $email );
+    }
   }
 
   return true;
@@ -276,6 +280,7 @@ function processItipCancel( vCalendar $vcal, vProperty $attendee, WritableCollec
   global $request;
   
   dbg_error_log( 'schedule', 'Processing iTIP CANCEL to %s', $attendee->Value());
+  header( "Debug: Could maybe do the iMIP message dance for attendee ". $attendee->Value() );
   if ( !$attendee_calendar->Exists() ) {
     if ( doImipMessage('CANCEL', $attendee_principal->email(), $vcal) ) {
       return '1.1'; // Scheduling whoosit 'Sent' 
@@ -327,6 +332,7 @@ function processItipCancel( vCalendar $vcal, vProperty $attendee, WritableCollec
  */
 function deliverItipCancel( vCalendar $iTIP, vProperty $attendee, WritableCollection $attendee_inbox ) {
   $attendee_inbox->WriteCalendarMember($iTIP, false);
+  header( "Debug: Could maybe do the iMIP message dance canceling for attendee: ".$attendee->Value());
 }
 
 require_once('Multipart.php');
@@ -341,6 +347,8 @@ require_once('Multipart.php');
 function doImipMessage($method, $to_email, vCalendar $itip) {
   global $c, $request;
 
+  header( 'Debug: Sending iMIP '.$method.' message to '.$to_email);
+  
   $mime = new MultiPart();
   $mime->addPart( $itip->Render(), 'text/calendar; charset=UTF-8; method='.$method );