In the main Postfix configuration file, how are service definitions continued on the next line?

It has been discovered that the company mail server is configured as an open relay. Which
of the following actions would help prevent the mail server from being used as an open
relay? (Choose TWO correct answers.)

Where is the procmail configuration of the user foo stored if home directories are located in
/home? (Specify the full name of the file, including path.)

What is the name of the procmail configuration file that is placed in a user home directory?
(Specify the file name only without any path.)

Which format, for storing user e-mail, uses the directories tmp, cur and new in order to solve
reliability problems in other storage formats?

Which setting in the Courier IMAP configuration file will tell the IMAP daemon to listen only
on the localhost interface?

When the default policy for the netfilter INPUT chain is set to DROP, why should a rule
allowing traffic to localhost exist?

On a Linux router, packet forwarding for IPv4 has been enabled. After a reboot, the machine
no longer forwards IP packets from other hosts. The commanD. echo 1 >
/proc/sys/net/ipv4/ip_forward temporarily resolves this issue. Which one of the following
options is the best way to ensure this setting is saved across system restarts?

The program vsftpd, running in a chroot jail, gives the following error: /bin/vsftpD. error while
loading shared libraries: libc.so.6: cannot open shared object filE. No such file or directory.
Which of the following actions would fix the error?

In order to prevent all anonymous FTP users from listing uploaded file names, what security
precaution can be taken when creating an upload directory?