用SquirrelMail收發郵件沒有問題， 而用pop3卻不行, 總提示認證失敗重新認證

用SquirrelMail收發郵件沒有問題， 而用pop3卻不行, 總提示認證失敗重新認證

伺服器安裝的Dovecot，Postfix, posftfixadmin,squirrelMail 用SquirrelMail收發郵件沒有問題， 而用pop3卻不行, 總提示認證失敗重新認證
================

# cat /etc/dovecot.conf
base_dir = /var/run/dovecot/
protocols = imap imaps pop3 pop3s
imap_listen = [::]
pop3_listen = [::]
ssl_disable = no
ssl_cert_file = /etc/ssl/certs/imapd.pem
ssl_key_file = /etc/ssl/private/imapd.pem
ssl_parameters_file = /var/run/dovecot/ssl-parameters.dat
login_dir = /var/run/dovecot-login
login = pop3
login = imap
mbox_locks = fcntl
auth = default
auth_mechanisms = plain
auth_userdb = passwd
auth_user = root
default_mail_env = maildir:/var/spool/mail/%u/
auth_userdb = mysql /etc/dovecot-mysql.conf
auth_passdb = mysql /etc/dovecot-mysql.conf
first_valid_uid = 501
===========================

# cat /etc/dovecot-mysql.conf
db_host = localhost
db_port = 3306
db_unix_socket = /var/lib/mysql/mysql.sock
db = postfix
db_user = postfix
db_passwd = postfix
db_client_flags = 0
default_pass_scheme = PLAIN-MD5
password_query = SELECT password FROM mailbox WHERE username = '%u'
user_query = SELECT maildir, 501 AS uid, 501 AS gid FROM mailbox WHERE username = '%u'
============================

# cat /etc/postfix/main.cf
#=====================BASE=========================
myhostname = mail.china.cn
mydomain = china.cn
myorigin = $mydomain
mydestination = $myhostname localhost localhost.$mydomain
mynetworks = 127.0.0.0/8
inet_interfaces = all
#=====================Vritual Mailbox settings=========================
virtual_mailbox_base = /var/spool/mail
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_alias_domains =
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_uid_maps = static:501
virtual_gid_maps = static:502
virtual_transport = virtual
maildrop_destination_recipient_limit = 1
maildrop_destination_concurrency_limit = 1
#====================QUOTA========================
message_size_limit = 14336000
virtual_mailbox_limit = 20971520
virtual_create_maildirsize = yes
virtual_mailbox_extended = yes
virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
virtual_mailbox_limit_override = yes
virtual_maildir_limit_message = Sorry, the user's maildir has overdrawn his diskspace quota, please try again later.
virtual_overquota_bounce = yes
#====================SASL========================
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_invalid_hostname,reject_non_fqdn_hostname,reject_unknown_sender_domain,reject_non_fqdn_sender,reject_non_fqdn_recipient,reject_unknown_recipient_domain,reject_unauth_pipelining,reject_unauth_destination,permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
smtpd_sasl_application_name = smtpd
smtpd_banner=$myhostname ESMTP "Version not Available"

readme_directory = no
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail
html_directory = no
setgid_group = postdrop
command_directory = /usr/sbin
manpage_directory = /usr/local/man
daemon_directory = /usr/libexec/postfix
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
queue_directory = /var/spool/postfix
mail_owner = postfix

#=====================SMTPS=====================
smtp_use_tls = yes
smtpd_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file = /etc/ssl/smtpd.pem
smtpd_tls_cert_file = /etc/ssl/smtpd.pem
smtpd_tls_CAfile = /etc/ssl/smtpd.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

============================

# netstat -an
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State      
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:688                 0.0.0.0:*                   LISTEN      
tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN      
tcp        0      0 :::993                      :::*                        LISTEN      
tcp        0      0 :::995                      :::*                        LISTEN      
tcp        0      0 :::110                      :::*                        LISTEN      
tcp        0      0 :::143                      :::*                        LISTEN      
tcp        0      0 :::80                       :::*                        LISTEN      
tcp        0      0 :::22                       :::*                        LISTEN      
tcp        0      0 :::443                      :::*                        LISTEN


=============================
# pstree
init-+-acpid
     |-ahd_dv_0
     |-ahd_dv_1
     |-atd
     |-courierlogger---authdaemond---10*
     |-crond
     |-cups-config-dae
     |-cupsd
     |-dbus-daemon-1
     |-dovecot-+-dovecot-auth
     |         |-3*
     |         `-3*
     |-events/0-+-aio/0
     |          |-aio/1
     |          |-kacpid
     |          |-kblockd/0
     |          |-kblockd/1
     |          |-khelper
     |          `-2*
     |-events/1-+-kauditd
     |          `-kmirrord
     |-gdm-binary---gdm-binary-+-X
     |                         `-gdmgreeter
     |-gpm
     |-hald
     |-htt---htt_server
     |-httpd---10*
     |-irqbalance
     |-khubd
     |-2*
     |-klogd
     |-kseriod
     |-ksoftirqd/0
     |-ksoftirqd/1
     |-kswapd0
     |-master-+-pickup
     |        |-qmgr
     |        `-tlsmgr
     |-migration/0
     |-migration/1
     |-6*
     |-mysqld_safe---mysqld
     |-portmap
     |-rpc.idmapd
     |-rpc.statd
     |-scsi_eh_0
     |-scsi_eh_1
     |-sshd---sshd---bash---pstree
     |-syslogd
     |-udevd
     |-xfs
     `-xinetd

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