+PH/05 Batch deliveries by appendfile and pipe transports did not work when the
+ addresses were routed directly to files or pipes from a redirect router.
+ File deliveries just didn't batch; pipe deliveries might have suffered
+ odd errors.
+
+PH/06 A failure to get a lock for a hints database would erroneously always say
+ "Failed to get write lock", even when it was really a read lock.
+
+PH/07 The appendfile transport was creating MBX lock files with a fixed mode
+ of 0600. This has been changed to use the value of the lockfile_mode
+ option (which defaults to 0600).
+