Ok, then it looks like it's better to stick with access/virtusertable rejection.
> But, if you have defined everyone in virtusertable with default rejects,
> sendmail will process invalid recipients faster than mimedefang can. You
> might still get a few instances where where a message comes in with a large
> number of invalid recipients that makes it obvious spam but it will still be
> accepted for a small number of valid addresses. You might be able to figure
> that out with some work in filter_recipient - or just hope that your other
> checks catch it.
NOTE: If there is a disclaimer or other legal boilerplate in the above
message, it is NULL AND VOID. You may ignore it.