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Clamav
Clamav is an open source antivirus engine. It have been used for virus scanning engine in a lot of project, e.g. email scanning, web proxy scanning. This post will help you go through some simple steps to install the clamav in your system.
Squid cache proxy
The post will guide you to install a squid-cache server which supporting LDAP authentication and ready for virus scanning and URL filtering. Transparent proxying will be setup for internal network while external user require LDAP authentication to access the proxy.
Backup & Restore using rsnapshot
rsnapshot is a superior utility for remote and local backup. By using rsync and hard links, it could keep multiple full backup by storing only the difference which could preserve a lot of disk space. Moreover, windows machine could be backup by using SAMBA mount.
Debugging sendmail queue delivery
Sometime, you may want to force sendmail to do queue delivery and maybe you would like to get the detail traffic of sending.