security purpose

Linux: Find Out Open Files [ Descriptors ] Command

by on January 4, 2012 · 2 comments

How do I find out that how many files are open and how many allowed in Linux server operating systems?

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Postfix Hide Client (MUA) System IP Address / Hostname

by on June 1, 2009 · 3 comments

I‘ve central mail server gateway. All of our internal systems through this box. How do I remove or hide the hostnames and IP addresses of our internal systems from the messages headers before they go out to other users for security purpose?

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