I often see email headers like these when I get email these days:

```
Received: by FQDN (Postfix, from userid $USERID)

```

So does that mean that people SSH into their VPS and send email from there **or** is there a way of relaying email from my local computer through the VPS?

Basically, I want to do the same to hide my IP address when I send an email through SMTP and want to use the VPS address instead.