Which file can be used to make sure that procmail is used to filter a user’s incoming email?

A user is on holiday for two weeks. Anyone sending an email to that account should receive
an autoresponse. Which of the following procmail rules should be used, so that all incoming
emails are processed by vacation?

What security precautions must be taken when creating a directory into which files can be
uploaded anonymously using FTP?

What is the correct format for an ftpusers file entry?

What is the path to the global postfix configuration file? (Please specify the complete
directory path and file name)

A system monitoring service checks the availability of a database server on port 5432 of
destination.example.com. The problem with this is that the password will be sent in clear
text. When using an SSH tunnel to solve the problem, which command should be used?

What must be done on a host to allow a user to log in to that host using an SSH key?

An SSH port-forwarded connection to the web server www.example.com was invoked using
the command ssh -TL 80 :www.example.com:80 user@www.example.com. Which TWO of
the following are correct?

Which of the following defines the maximum allowed article size in the configuration file for
INN?

The innd configuration file has been changed and it should be used as soon as possible.
What is the fastest way to accomplish that?