A common way to do this would be to use an email forwarder. An email forwarder allows you to forward individual emails into separate mailboxes.
To forward email messages to multiple addresses, create email forwarders for each destination address.
For example, if you want email@example.com to forward its mail to both firstname.lastname@example.org and email@example.com, add the following forwarders:
- firstname.lastname@example.org –> email@example.com
- firstname.lastname@example.org –> email@example.com
You can do this in cPanel’s Home >> Email >> Forwarder.
Note: You shouldn’t create an email account for firstname.lastname@example.org unless you want to also check that account’s mail messages as email@example.com.