"Linux rookie 2" Shell mail Service

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1. Meaning of introducing empty shell messages

Mail server directly exposed in the network environment, Security will be greatly reduced, so the introduction of "Shell Server" is to ensure the security of the real server, the function of the shell server is to be subject to the mail Forwarding (bidirectional).

2. Making Empty Shell Mail

Under the premise of configuring DNS:

Empty shell server Configuration (maillinux.linux.com):

Vim/etc/named.rfc1912.zones

cd/var/named/

Cp-p Westos.com.zone Westos.org.zone

Vim Westos.org.zone

Remove the previous mail service configuration, reinstall reinstall the Postfix service, modify the configuration file

Rm-fr/etc/postfix/main.cf

Yum Reinstall postfix-y

Systemctl Restart Postfix.service

Vim/etc/postfix/main.cf

Systemctl Restart Postfix.service

Systemctl Start mariadb

Systemctl Start httpd

Systemctl Stop Firewalld

cd/home/vmail/

RM-FR westos.org/

Vim/etc/postfix/main.cf

Systemctl Restart Postfix.service

3. Test.

Send mail to the Shell Mail server (maillinux.linux.com), and use the Watch-n 1 command on the real server (mailwestos.westos.com) to monitor whether the shell server forwards the message

4. Note

In this experiment, firewalld.service need to be closed.

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"Linux rookie 2" Shell mail Service