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 = dovecotsmtpd_sasl_path = private/auth-clientsmtpd_sasl_auth_enable = yessmtpd_sasl_security_options = noanonymoussmtpd_sasl_local_domain = $myhostnamesmtpd_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 ~]#

chkconfigsendmail 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 ~]#

chkconfigpostfix on