Index: /CKEditor/branches/features/aria/_source/plugins/link/dialogs/link.js
===================================================================
--- /CKEditor/branches/features/aria/_source/plugins/link/dialogs/link.js	(revision 4973)
+++ /CKEditor/branches/features/aria/_source/plugins/link/dialogs/link.js	(revision 4974)
@@ -636,4 +636,5 @@
 								id : 'emailAddress',
 								label : editor.lang.link.emailAddress,
+								required : true,
 								validate : function()
 								{