Please first read [Postfix documentation on virtual aliases](http://www.postfix.org/VIRTUAL_README.html#virtual_alias).

Aliases are managed in `config/postfix-virtual.cf`.
An alias is a full email address that will be:
* delivered to an existing account in `config/postfix-accounts.cf`
* redirected to one or more other email addresses

Alias and target are space separated.

Example:

    # Alias to existing account
    alias1@domain.tld user1@domain.tld

    # Forward to external email address
    alias2@domain.tld external@gmail.com