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In general, there are two strategies for implementing Linux firewall functionality. One is to completely prohibit all input, output and forwarding packets, and then gradually open each service function according to the user's specific needs. This approach is characterized by a high degree of security, but must take into account all the service features required by the user, without any omission, requiring the system administrator to be aware of what services and ports are needed to implement a s

Tags: Linux mail system POP3 postfix dovecot8. Install Apache Http Server:[email protected] ~]# Yum install httpd9. Download Extmail and Extman and initialize the Extmail database using the MySQL script provided by ExtmanVisit the Extmail official website (http://www.extmail.org/) to download the Extmail and Extman package, unzip:[Email protected] ~]# tar-xf extmail-1.2.tar.gz [[email protected] ~]# TAR-XF