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→Listening on all interfaces
<li>Ensure that your '''hostname''' is properly set on your machine (including the domain name), otherwise you will need to set the '''myhostname''' parameter.</li>
{{Admon/important|Warning|Make sure there are no other uncommented copies of these parameters in the file.}}
<li>Restart the postfix service and confirm (using the '''ss''' command) to confirm that the service 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>
==INVESTIGATION 3: SENDING EMAIL BETWEEN MTAs (NO ENCRYPTION)==
