Step 1: $ sudo apt-get install postfix
Postfix configuration screen throws you with the following options to choose from
i) No changes (no changes to configuration settings)
ii) Internet site (Mail sent and received using SMTP)
iii) Internet with smarthost (Mail sent to another machine called smarthost)
iV) Satellite system (All mail sent to another machine for delivery)
v) Local only (No network based mail system. Only applied to this local machine)
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