Fedora 18
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Install/Configure Postfix
2013/01/27
 
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:
2
 
# change to Postfix
[root@mail ~]#
systemctl start postfix.service

[root@mail ~]#
systemctl enable postfix.service

 
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