diff --git a/UI/MailPartViewers/UIxMailPartMixedViewer.m b/UI/MailPartViewers/UIxMailPartMixedViewer.m
index 6a36c2457..577de6e4b 100644
--- a/UI/MailPartViewers/UIxMailPartMixedViewer.m
+++ b/UI/MailPartViewers/UIxMailPartMixedViewer.m
@@ -87,6 +87,7 @@
   id info, viewer;
   NSArray *parts;
   NSMutableArray *renderedParts;
+  NSString *contentType;
   NSUInteger i, max;
 
   parts = [[self bodyInfo] objectForKey: @"parts"];
@@ -102,9 +103,13 @@
       [viewer setPartPath: [self childPartPath]];
       [renderedParts addObject: [viewer renderedPart]];
     }
+  contentType = [NSString stringWithFormat: @"%@/%@",
+                          [[self bodyInfo] objectForKey: @"type"],
+                          [[self bodyInfo] objectForKey: @"subtype"]];
 
   return [NSDictionary dictionaryWithObjectsAndKeys:
                          [self className], @"type",
+                       contentType, @"contentType",
                        renderedParts, @"content",
                        nil];
 }