CentOS 5
Install/Configure Postfix
 
This is How to Build SMTP Server with Postfix.
[1] Install/Configure Postfix
[root@mail ~]#
yum -y install postfix
[root@mail ~]#
vi /etc/postfix/main.cf
# line 70: uncomment and specify hostname

myhostname =
mail.server.world
# line 77: uncomment and specify domain name

mydomain =
server.world
# line 93: uncomment

myorigin = $mydomain
# line 110: change

inet_interfaces =
all
# line 155: add

mydestination = $myhostname, localhost.$mydomain, localhost
, $mydomain
# line 255: uncomment and specify LAN

mynetworks = 127.0.0.0/8,
10.0.0.0/24
# line 410: uncomment (use Maildir)

home_mailbox = Maildir/
# line 536: uncomment; line 537: add

header_checks = regexp:/etc/postfix/header_checks
body_checks = regexp:/etc/postfix/body_checks
# line 562: add

smtpd_banner = $myhostname ESMTP
# add at the bottom

# limit an email size 5M

message_size_limit = 5242880

# limit mailbox 100M

mailbox_size_limit = 104857600
# for SMTP-Auth setting

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth-client
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_client_restrictions = permit_mynetworks,reject_unknown_client,permit
smtpd_recipient_restrictions = permit_mynetworks,permit_auth_destination,permit_sasl_authenticated,reject
[root@mail ~]#
vi /etc/postfix/header_checks
# add at the head

# reject if email address is empty

/^From:.*<#.*@.*>/ REJECT
/^Return-Path:.*<#.*@.*>/ REJECT
[root@mail ~]#
vi /etc/postfix/body_checks
# reject if includes 'example.com' in mail body

/^(|[^>].*)example.com/ REJECT
[root@mail ~]#
/etc/rc.d/init.d/sendmail stop

Shutting down sm-client:
[  OK  ]

Shutting down sendmail:
[  OK  ]

[root@mail ~]#
chkconfig sendmail off

[root@mail ~]#
alternatives --config mta
 
# change default MTA
There are 2 programs which provide 'mta'.
Selection      Command
-----------------------------------------------
*+ 1
  /usr/sbin/sendmail.sendmail

2
  /usr/sbin/sendmail.postfix
Enter to keep the current selection[+], or type selection number:
2
 
# switch to postfix
[root@mail ~]#
/etc/rc.d/init.d/postfix start

Starting postfix:
[  OK  ]

[root@mail ~]#
chkconfig postfix on

 
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