It is absolutely possible to redirect an alias to multiple recipient. To do that, just separate the emails using a comma:
firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
Please note that the free plan limits to 5 maximum recipients. We are doing this to protect our email sending reputation. If you need to redirect to more users, please look into shared inboxes providers like Front, or mailing list software like Mailchimp.
This limit can be lifted manually for business plans upon manual review. Please contact us for further information.