Can I set my email up so 2 (or more) accounts receive mail sent to 1 address ?
Yes. Create a forwarder from the account receiving the mail to the account that should also get the mail.
For example, if people are emailing email@example.com but you also want firstname.lastname@example.org to receive that mail, set up a forwarder from email@example.com to firstname.lastname@example.org, and both accounts will receive the email.
Tip: You can add as many forwarders as you want to get copies of the email sent to more accounts.