See here how to setup an email account with Postfix, the popular email server.
Edit /etc/postfix/virtual.cf .
```bash vim /etc/postfix/virtual.cf```Add line:
```bash user@example.com localusername```postmap /etc/postfix/virtual.cf```
```bash
vim /etc/aliases```
<p>Add line:</p>
```bash
localusername: someother@othersite.com```
```bash
newaliases```