Here are the steps:

• Log in to the web interface using the admin account
• Click Manage Distribution List under Server Configuration
• Create a new list. The List Address will be the address you expect the incoming email. For example football.team@yourcompany.com . Put comma separated email addresses in the Forward To field. For example: john@yourcompany.com, bob@gmail.com. 
• Every incoming email to the football.team will go to both recipients.