Mailbox location

I am running a small server with a fixed number of users. Postfix is using dovecot lda so that I can run pigeonhole. I have setup a user file with the ids and passwords and everything authenticates properly. Postfix uses that also. However, mail is consistently delivered to user@domain. How do I tell it to deliver to just user? I have tried setting a variety of different things like:

10-mail.conf:mail_location = maildir:/var/mail/home_mail/%u

userdb { driver = static args = uid=2222 gid=2222 home=/var/mail/home_mail/%u }

and a few other things. None of them affected the mailbox location. Fortunately, this is a test system as I probably have mucked up the config files by now.

— Doug