IMAP /etc/userdb and postfix

I'll ask and duck... It appears as though several have gotten flamed for
the same question - but I'll be da**ned if I can find it.

I think I now have postfix mail receiving to real *nix accounts as well
as virtual. I used the create of /etc/userdb, manually duplicated then
entries for the virtual domains, and then set the password for
each...the /etc/userdb file looks reasonable.

In my various trys to access the mail, other than by "cat" or "less" of
the /var/mail/vhost/domain-name/user, I have not implemented a
successful retrieve. It appears as though I wish to implement

local_recipient_maps =3D something...

but "something" is not obvious. I am trying to avoid cyrus sasl mysql
etc., etc. I'm only talking a dozen users for each of 3 domains.

My apologies to Wietse...but what is the "something" if I have
implemented the courier imap specified /etc/userdb ?

ducking and covering...

- Bill