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Feodra 18 MAIL Server Install/Configure Postfix


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.server.world


# line 83: uncomment and specify domain name

mydomain = server.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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