CentOS 6
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Install Postfix
2014/08/22
 
Install Postfix to configure SMTP server. SMTP uses 25/TCP.
[1] Postfix is installed even if CentOS system was installed with [Minimal Install], but if Postfix is not, Install it first like follows.
[root@mail ~]#
yum -y install postfix
[2] This example shows to configure SMTP-Auth to use Dovecot's SASL function.
[root@mail ~]#
vi /etc/postfix/main.cf
# line 75: uncomment and specify the hostname

myhostname =
mail.srv.world
# line 83: uncomment and specify the domain name

mydomain =
srv.world
# line 99: uncomment

myorigin = $mydomain
# line 116: change

inet_interfaces =
all
# line 119: change if you use only IPv4

inet_protocols =
ipv4
# line 164: add

mydestination = $myhostname, localhost.$mydomain, localhost
, $mydomain
# line 264: uncomment and specify your local network

mynetworks = 127.0.0.0/8,
10.0.0.0/24
# line 419: uncomment (use Maildir)

home_mailbox = Maildir/
# line 571: add

smtpd_banner = $myhostname ESMTP
# add follows to the end

# limit an email size for 10M

message_size_limit = 10485760

# limit a mailbox for 1G

mailbox_size_limit = 1073741824
# for SMTP-Auth

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_mynetworks, permit_auth_destination, permit_sasl_authenticated, reject
[root@mail ~]#
/etc/rc.d/init.d/postfix start

Starting postfix:
[  OK  ]

[root@mail ~]#
chkconfig postfix on

[3] If IPTables is running, allow SMTP port. SMTP uses 25/TCP.
For "-I INPUT 5" section below, Replace it to your own environment.
[root@dlp ~]#
iptables -I INPUT 5 -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT

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