lost connection with mx1.lix.aon.at[213.33.87.13] while performing the HELO hand

lost connection with mx1.lix.aon.at[213.33.87.13] while performing the HELO hand

郵件伺服器，外發郵件到部分域，一直deferred，比如163,263都是如此，gmail,hotmail卻是正常的，請大家幫我看看，下面是相關日誌:

Apr 15 06:26:35 mail postfix/qmgr: 6905654725: from=<ward.wei@constab.cn>, size=176686, nrcpt=5 (queue active)
Apr 15 06:26:35 mail postfix/smtp: 6905654725: enabling PIX workarounds: disable_esmtp delay_dotcrlf for mx1.lix.aon.at:25
Apr 15 06:26:35 mail postfix/smtp: 6905654725: enabling PIX workarounds: disable_esmtp delay_dotcrlf for mx1.lix.aon.at:25
Apr 15 06:26:35 mail postfix/smtp: 6905654725: to=<michaela.anzinger@plastrans.com>, relay=mx1.lix.aon.at:25, delay=233702, delays=233702/0/0.62/0, dsn=4.4.2, status=deferred (lost connection with mx1.lix.aon.at while performing the HELO handshake)

/etc/postfix/main.cf
myhostname = mail.constab.cn
mydomain = constab.cn
myorigin = $mydomain

mydestination = $myhostname, localhost
inet_interfaces = all

###### cyrus sasl2 support
smtpd_sasl_path = smtpd
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous
smtpd_recipient_restrictions =
                permit_mynetworks,
                permit_sasl_authenticated,
                check_relay_domains,
                reject_unauth_destination
#smtp_sasl_auth_enable = yes
#smtp_sasl_security_options = noanonymous
smtpd_client_restrictions =
                permit_sasl_authenticated,
                permit_mynetworks,
                permit
smtpd_data_restrictions =
                reject_unauth_pipelining,
                permit
#### mysql support
virtual_transport = virtual
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql/mysql_virtual_domains_maps.cf
virtual_alias_maps =
        proxy:mysql:/etc/postfix/mysql/mysql_virtual_alias_maps.cf,
        proxy:mysql:/etc/postfix/mysql/mysql_virtual_alias_domain_maps.cf,
        proxy:mysql:/etc/postfix/mysql/mysql_virtual_alias_domain_catchall_maps.cf
virtual_mailbox_maps =
        proxy:mysql:/etc/postfix/mysql/mysql_virtual_mailbox_maps.cf,
        proxy:mysql:/etc/postfix/mysql/mysql_virtual_alias_domain_mailbox_maps.cf
virtual_mailbox_base = /var/mailbox/
virtual_minimum_uid = 503
virtual_uid_maps = static:503
virtual_gid_maps = static:503

# Additional for quota support
virtual_create_maildirsize = yes
virtual_mailbox_extended = yes
virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql/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
virtual_trash_count = yes
virtual_trash_name = ".Trash"

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
data_directory = /var/lib/postfix

message_size_limit = 10240000

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