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<li>Restart the postfix service (using the '''ss''' command) to confirm that the your MTA is now listening on <u>all</u> interfaces (not just loopback)</li>
<li>Test by connecting to it (using the '''nc''' command) from your '''vm3''' machine.</li></ol>
'''Record steps, commands, and your observations in INVESTIGATION 2 in your OPS335 lab log-book'''
==INVESTIGATION 3: SENDING EMAIL BETWEEN MTAs (NO ENCRYPTION)==
{{Admon/important |Backup your VMs!|You MUST perform a '''full backup''' of ALL of your VMs whenever you complete your '''OPS335 labs''' or when working on your '''OPS335 assignments'''. You should be using the dump command, and you should use the Bash shell script that you were adviced to create in order to backup all of your VMs.}}
'''Record steps, commands, and your observations in INVESTIGATION 2 in your OPS335 lab log-book'''
==COMPLETING THE LAB==
Upon completion of this lab you should have postfix mail servers running on two machines, and starting automatically when they do. These servers must have sent email both ways between each other (from vm2 to vm3, and from vm3 to vm2), and to your seneca email (or other external mail server).