Install Postfix

Install Postfix 2014/07/21

	Install Postfix to configure SMTP server. SMTP uses 25/TCP.
[1]	Postfix is installed even if CentOS system was installed with [Minimal Install], but if Postfix is not, Install it first like follows.

[root@mail ~]#  yum -y install postfix

[2]	This example shows to configure SMTP-Auth to use Dovecot's SASL function.

[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 local network mynetworks = 127.0.0.0/8,  10.0.0.0/24 # line 419: uncomment (use Maildir) home_mailbox = Maildir/ # line 574: add smtpd_banner = $myhostname ESMTP # add follows to the end # limit an email size for 10M message_size_limit = 10485760 # limit a mailbox for 1G mailbox_size_limit = 1073741824 # for SMTP-Auth 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_recipient_restrictions = permit_mynetworks,permit_auth_destination,permit_sasl_authenticated,reject [root@mail ~]#  systemctl restart postfix  [root@mail ~]#  systemctl enable postfix