--- a/dovecot-example.conf	Wed Apr 12 17:04:55 2006 +0300
+++ b/dovecot-example.conf	Wed Apr 12 17:36:58 2006 +0300
@@ -617,6 +617,12 @@
 # that '#' and '/' characters are translated to '@'.
 #auth_username_translation =
 
+# Username formatting before it's looked up from databases. You can use
+# the standard variables here, eg. %Lu would lowercase the username, %n would
+# drop away the domain if it was given, or "%n-AT-%d" would change the '@' into
+# "-AT-". This translation is done after auth_username_translation changes.
+#auth_username_format =
+
 # If you want to allow master users to log in by specifying the master
 # username within the normal username string (ie. not using SASL mechanism's
 # support for it), you can specify the separator character here. The format