Testing installation of Dovecot. Log is showing two errors. Any ideas how to fix this thing???

dovecot: May 07 05:19:06 Error: auth-worker(default): pam(Yoda,127.0.0.1): pam_authenticate() failed: User not known to the underlying authentication module dovecot: May 07 05:21:48 Error: IMAP(Yoda): open() failed with mbox file /var/mail/Yoda: Permission denied

Here's the dovecot.conf file

# 1.1.rc4: /usr/local/etc/dovecot.conf base_dir: /var/run/dovecot/ log_path: /var/log/dovecot.log info_log_path: /var/log/dovecot-info.log protocols: imap imaps pop3 pop3s listen(default): *:143 listen(imap): *:143 listen(pop3): *:10100 ssl_disable: yes disable_plaintext_auth: no login_dir: /var/run/dovecot//login login_executable(default): /usr/local/libexec/dovecot/imap-login login_executable(imap): /usr/local/libexec/dovecot/imap-login login_executable(pop3): /usr/local/libexec/dovecot/pop3-login verbose_proctitle: yes first_valid_uid: 1000 last_valid_uid: 5000 mail_privileged_group: mail mail_location: mbox:/var/empty:INBOX=/var/mail/%u:INDEX=MEMORY mail_debug: yes mbox_write_locks: fcntl mbox_very_dirty_syncs: yes mail_executable(default): /usr/local/libexec/dovecot/imap mail_executable(imap): /usr/local/libexec/dovecot/imap mail_executable(pop3): /usr/local/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/local/lib/dovecot/imap mail_plugin_dir(imap): /usr/local/lib/dovecot/imap mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3 auth default: debug: yes debug_passwords: yes passdb: driver: pam passdb: driver: passwd passdb: driver: shadow passdb: driver: passwd-file args: /usr/local/etc/dovecot.passdb userdb: driver: passwd userdb: driver: passwd-file args: /usr/local/etc/dovecot.passdb socket: type: listen master: path: /var/run/dovecot/auth-master mode: 384 user: dovecot group: mail

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