--- a/exim.schema	Thu Oct 24 23:40:20 2013 +0200
+++ b/exim.schema	Thu Oct 24 23:41:01 2013 +0200
@@ -45,6 +45,12 @@
     eximAttribute:4 NAME ('x-MailRecipientDN') DESC 'forwarding information to other DN'
     SUP distinguishedName )
 
+attributetype (
+    eximAttribute:5 NAME ('x-MailboxName') DESC 'name of the mailbox as known to the mail storage'
+    EQUALITY caseIgnoreIA5Match
+    SUBSTR caseIgnoreIA5SubstringsMatch
+    SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )
+
 ####
 
 objectClass (