顺便再补下postfix的配置文件
data_directory = /var/lib/postfix
debug_peer_level = 2
html_directory = /usr/share/doc/postfix-2.6.2-documentation/html
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.2-documentation/readme
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
unknown_local_recipient_reject_code = 550
header_checks = regexp:/etc/postfix/header_checks       #MailScanner
local_destination_concurrency_limit = 1

# hostname
mynetworks = 127.0.0.1
myhostname = mail.wing.com
mydomain = wing.com
#mydestination = $mynetworks $myhostname $mydomain

# banner
mail_name = Postfix - by wing.com
smtpd_banner = $myhostname ESMTP $mail_name

# response immediately
smtpd_error_sleep_time = 0s

# Message and return code control
message_size_limit = 5242880
mailbox_size_limit = 5242880
show_user_unknown_table_name = no

# Queue lifetime control
bounce_queue_lifetime = 1d
maximal_queue_lifetime = 1d

# extmail config here
virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_transport = maildrop:

smtpd_recipient_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        reject_non_fqdn_hostname,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        reject_unauth_destination,
        reject_unauth_pipelining,
        reject_invalid_hostname,

# SMTP sender login matching config
smtpd_sender_restrictions =
                               permit_mynetworks,
        reject_sender_login_mismatch,
        reject_authenticated_sender_login_mismatch,
        reject_unauthenticated_sender_login_mismatch

smtpd_sender_login_maps =
        mysql:/etc/postfix/mysql_virtual_sender_maps.cf,
        mysql:/etc/postfix/mysql_virtual_alias_maps.cf

# SMTP AUTH config here
broken_sasl_auth_clients = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous