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## 不懂的直接 vim /etc/postfix/main.cf 然后复制下面代码到你的服务器上，修改下相应的IP与域名即可
#============================基本配置=============================================================
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
myhostname = mail.szzmzb.com
mydomain = szzmzb.com
myorigin = $mydomain
inet_interfaces = all
inet_protocols = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
unknown_local_recipient_reject_code = 550
#mynetworks = 0.0.0.0/0, 192.168.0.0/24, 127.0.0.0/8, 113.105.117.2
mynetworks = 192.168.0.0/24, 127.0.0.0/8
relay_domains = $mydestination
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
home_mailbox = Maildir/

smtpd_banner = $myhostname ESMTP unknow
#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
smtpd_sasl_auth_enable = yes
smtpd_delay_reject = no
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
#smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination,reject_unknown_sender_domain, reject_unknown_hostname,reject_unauth_destination
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination

debug_peer_level = 2
debugger_command =
         PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
         ddd $daemon_directory/$process_name $process_id & sleep 5