Email relay

Principle

Our server will forward all emails to another SMTP server. The SMTP server we're gonna install is stupid: only local domain, no account checking, no anti-virus or spam protection.

1. From main SMTP server ("Gmail", "Outlook", ...) all emails come from the same account.
2. From a local point of view, all emails are send using Linux default configuration and system users

Principle:

As you can see, POSTFIX SMTP server will just act as a proxy between local services and Gmail.