discard-no-mailbox patch.

[Ryan Duda]

><snip>
>
>However, I have patched my copy of vdelivermail to allow a third
>option - discard-no-mailbox.  This will "silently" discard the
>message if it is bound for an invalid recipient (it does log the
>action), and returns 0 for success so the message is removed from
>the queue.
>
>Eric Calvert

Eric is this a patch you wrote or came across? It seems like a useful 
option that vdelivermail is missing.

regards,
-Ryan