If you are using the Postfix MTA and own your own domain (example.com), you can configure it to forward to
firstname.lastname@example.org alongside any other user account.
main.cf configuration file, or with the overrides in
master.cf set the following options:
mydomain = example.com
mydestination = localhost.localdomain, localhost, local.$mydomain # Basically, anything but $mydomain
This will have Postfix treat mail to your root account as
email@example.com and route it accordingly, whether relay to your
relayhost or deliver it to example.com directly. With this configuration Postfix will deliver mail to
firstname.lastname@example.org to your local mailbox (
/var/mail/root or wherever your system delivers system mail).