Yes, they were trivial, but all the same, we've got a lot on our 
plates. It'd be awfully nice of you to supply patches in the future.

                 list($mailbox, $host) = @explode('@', $email);

                 if (empty($host)) {

                     $host = $conf['server']['name'];

                 }



If the "explode" returns other than two results, the first line 
produces an error, although the second line is probably supposed to 
catch just that error.  The required changes are trivial.