Install/Configure Postfix2013/07/11

	Install Postfix to configure SMTP Server. This example shows to configure SMTP-Auth to use Dovecot's SASL function.
[1]	Install and Configure Postfix

[root@mail ~]#

yum -y install postfix

[root@mail ~]#

vi /etc/postfix/main.cf

# line 75: uncomment and specify hostname

myhostname =

mail.srv.world

# line 83: uncomment and specify domain name

mydomain =

srv.world

# line 99: uncomment

myorigin = $mydomain

# line 116: change

inet_interfaces =

all

# line 164: add

mydestination = $myhostname, localhost.$mydomain, localhost

, $mydomain

# line 264: uncomment and specify your LAN

mynetworks = 127.0.0.0/8,

10.0.0.0/24

# line 419: uncomment (use Maildir)

home_mailbox = Maildir/

# line 548: uncomment, line 549: add the line

header_checks = regexp:/etc/postfix/header_checks

body_checks = regexp:/etc/postfix/body_checks

# line 574: add the line

smtpd_banner = $myhostname ESMTP

# add at the last line

# limit an email size 10M

message_size_limit = 10485760

# limit mailbox 1G

mailbox_size_limit = 1073741824

# for SMTP-Auth settings

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_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

# for example, reject from "example.com"

/^From:.*@example\.com/ REJECT

[root@mail ~]#

vi /etc/postfix/body_checks

# for example, reject if "example.com" is in mail body

/^(|[^>].*)example.com/ REJECT

[root@mail ~]#

systemctl stop sendmail.service

[root@mail ~]#

systemctl disable sendmail.service

[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:

# change to Postfix

[root@mail ~]#

systemctl start postfix.service

[root@mail ~]#

systemctl enable postfix.service

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