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'''Draft - This lab is still under construction.'''
Protected "OPS535-online-L5": OER transfer ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))
[[Category:OPS535]][[Category:rchan]]
=Overview=
Postfix is a complete MTA (Mail Transport Agent) package which replaced Sendmail. Postfix uses several different programs to implement the MTA functionality. Postfix is considered to be more secure than Sendmail as it requires a separate user ID for running each module. Postfix uses plain text parameters and value names in its configuration files. The Postfix program plays a variety of roles:
** all your four VMs have network connectivity to each other via the ens224 network interfaces.
** your VMs have the proper FQDN which can be resolved by your authoritative DNS server(s).
* Install the nmap-ncat, tree, and mailx packages on your host (optinally, install it on your other VMs as well).
* Install postfix if it is not installed.
</pre>
* Go to the /tmp directory, and search for the files named "ops535.mail", and "rchan.mail". [Hint: you have to look deeper into the /tmp directory]
* Get the locations (i.e. path names), owners, permission settings, and contents of the above two files for lab submission.
= Completing the Lab =
Please download the [https://raw.githubusercontent.com/rayfreeping/ops535/master/labs/labcheck5.bash check lab script named labcheck5.bash] to your VM2, run the script under the 'student' user with sudo privilege and capture the output to a file and named it as lab5_vm3.txt:
<pre>
[student@pri-dns labs]$ sudo bash labcheck5.bash > lab5_vm2.txt
</pre>
Upload the file "lab5_vm2.txt" to Blackboard by the posted lab5 due date.
= Review Questions =