Log Message:
Update mail/courier-maildir to 0.49.0.  Changes from version 0.48.2
include:

    * maildir/maildirquota.c (docheckquota): Memory used after being freed.

    * maildir/deliverquota.c (deliver): Overquota condition is now a
      temporary delivery failure, in accordance with the new backscatter
      suppression logic.