postfix + dovecot não recebe email

Ola a todos. Estou tentando montar meu primeiro servidor de email com postfix + dovecot + maildir porém, nao estou conseguindo receber emails. Andei dando uma olhada nos logs e vi as seguintes mensagens:

cat /var/log/mail.err
Jan 29 16:36:22 kurumin dovecot: POP3(jorge): Ambiguous mail location setting, don't know what to do with it: /var/mail/u (try prefixing it with mbox: or maildir:)
Jan 29 16:36:22 kurumin dovecot: POP3(jorge): Failed to create storage with data: /var/mail/u
Jan 29 16:36:22 kurumin dovecot: child 25708 (pop3) returned error 89

cat /var/log/mail.log
Jan 30 16:36:06 kurumin postfix/smtpd[7020]: connect from kurumin[127.0.0.1]
Jan 30 16:36:38 kurumin postfix/smtpd[7020]: E09B453890: client=kurumin[127.0.0.1]
Jan 30 16:36:46 kurumin postfix/cleanup[8858]: E09B453890: message-id=<[email protected]>
Jan 30 16:36:46 kurumin postfix/qmgr[6554]: E09B453890: from=<[email protected]>, size=354, nrcpt=1 (queue active)
Jan 30 16:36:46 kurumin postfix/local[9257]: warning: database /etc/aliases.db is older than source file /etc/aliases
Jan 30 16:36:46 kurumin postfix/local[9257]: E09B453890: to=<[email protected]>, relay=local, delay=17, delays=17/0.06/0/0.04, dsn=2.0.0, status=sent (delivered to maildir)
Jan 30 16:36:46 kurumin postfix/qmgr[6554]: E09B453890: removed
Jan 30 16:36:48 kurumin postfix/smtpd[7020]: disconnect from kurumin[127.0.0.1]


Abaixo vou postar meu main.cf e meu dovecot.conf. Se alguem puder me ajudar eu agradeceria.

main.cf
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt
smtpd_tls_key_file = /etc/ssl/private/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
myhostname = kurumin.com.br
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = $myhostname, $mydomain, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.1/8
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
myorigin = /etc/mailname
inet_protocols = all
relay_domains=$mydestination
smtpd_sasl_local_domain =
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
home_mailbox = Maildir/
mailbox_command =


dovecot.conf
base_dir = /var/run/dovecot/
protocols = pop3
disable_plaintext_auth = no
log_timestamp = "%Y-%m-%d %H:%M:%S "
ssl_disable = yes
ssl_cert_file = /etc/ssl/certs/dovecot.pem
ssl_key_file = /etc/ssl/private/dovecot.pem
login_dir = /var/run/dovecot/login
mail_extra_groups = mail
protocol imap {
}
protocol pop3 {
pop3_uidl_format = %08Xu%08Xv
}
auth default {
mechanisms = plain
passdb pam {
}
userdb passwd {
}
dict {
}
plugin {
}

[]'s,
Renato