Unable to create needed folders

[Ken Zachreson]

Greetings,

The log reports that a process cannot create the needed folders. Please review and tell me what I have done wrong.

dovecot 2.0.9
# 2.0.9: /etc/dovecot/dovecot.conf
doveconf: Warning: NOTE: You can get a new clean config file with: doveconf -n > dovecot-new.conf
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:85: protocol { ssl_listen } has been replaced by service { inet_listener { address } }
# OS: Linux 2.6.32-642.15.1.el6.x86_64 x86_64 CentOS release 6.8 (Final)
auth_mechanisms = plain login
last_valid_gid = 520
last_valid_uid = 520
mail_location = mbox:~/mail/:INBOX=/var/mail/%u
mbox_write_locks = fcntl
passdb {
  args = dovecot
  driver = pam
}
protocols = imap
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
}
service imap-login {
  inet_listener imaps {
    address = *
  }
}
service pop3-login {
  inet_listener pop3s {
    address = *
  }
}
ssl_ca = /etc/pki/tls/certs/gd_bundle-g2-g1.crt
ssl_cert = </etc/pki/tls/certs/c1e209e3ca2e1e5.crt
ssl_key = </etc/pki/tls/private/gcrcnet.key
userdb {
  driver = passwd
}
protocol pop3 {
  pop3_uidl_format = %08Xv%08Xu
}

ERROR Message from log 

Mar 15 10:14:03 MultiTronic6 dovecot: imap-login: Login: user=<wifi.adm>, method=LOGIN, rip=xx.xx.xx.xx, lip=yy.yy.yy.yy, mpid=5973, TLS
Mar 15 10:14:03 MultiTronic6 dovecot: imap(wifi.adm): Error: chown(/home/wifi.adm/mail/.imap/INBOX, -1, 12(mail)) failed: Operation not permitted (egid=504(wifi.adm), group based on /var/mail/wifi.adm)
Mar 15 10:14:03 MultiTronic6 dovecot: imap(wifi.adm): Error: mkdir(/home/wifi.adm/mail/.imap/INBOX) failed: Operation not permitted
Mar 15 10:14:03 MultiTronic6 dovecot: imap(wifi.adm): Connection closed bytes=39/423

Thank You,
Ken Zachreson
IT Manager, Grand Canyon Resort Corp
928-769-2629
928-769-2638 Help Desk