Alias Domains: transparently deliver to [email protected]

Hi all

In a setup with alias domains for a parent domain, is there a way to
transparently deliver mail addressed to an alias domain, to the mail
address in the parent domain, without explicitly listing them in a
user's contacts?

Example:

Parent domain: example.com
Aliases: example.org, example.net

deliver [email protected], [email protected] -> [email protected]

Regards,
Florian