How to ignore User Unknown? <Procmail Newbie>

Hi All,

I'm using Sendmail 8.10.0 with LDAP Mail Routing to eliminate the need for
creating users on heaps of mail servers.....

The problem I have is while i have convinced Sendmail to ignore whether
the local user exists but only if the directory says it should go there I
cannot find a way to make procmail ignore the fact that the user doesn't
exist in /etc/passwd....

How can I disable this behaviour I can't find it in the procmail and
procmailrc man pages...

Darren