ubuntu 10.10 postfix + dovecot 能发送邮件，不能接收邮件

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postfix + dovecot 能发送邮件，不能接收邮件

This is the mail system at host localhost.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

这个是返回的邮件服务器信息

postfix 配置文件

append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
home_mailbox = Maildir/
inet_interfaces = all
mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -n -m "${EXTENSION}"
mailbox_size_limit = 0
myhostname = localhost
mynetworks = 0.0.0.0/0
myorigin = $myhostname
recipient_delimiter = +
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/dovecot-auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_received_header = yes
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_gid_maps = static:5000
virtual_mailbox_base = /home/vmail
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 1000
virtual_uid_maps = static:5000


dovecot 配置文件

# 1.2.12: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.35-23-server x86_64 Ubuntu 10.10 ext4
log_path: /var/log/dovecot.log
protocols: pop3 pop3s
ssl: no
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable: /usr/lib/dovecot/pop3-login
first_valid_uid: 5000
mail_uid: 5000
mail_gid: 5000
mail_location: maildir:/home/vmail/%u/
mbox_write_locks: fcntl dotlock
mail_executable: /usr/lib/dovecot/pop3
mail_plugin_dir: /usr/lib/dovecot/modules/pop3
auth default:
  mechanisms: PLAIN LOGIN
  debug: yes
  passdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  userdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 432
      user: vmail
      group: vmail

请指导一下