As you are getting used to administering BPOS - an important feature is the ability to create distribution groups (just like you used to have in Exchange). Common distribution groups are for sales, marketing, customer service, management, etc.
Log into the BPOS Administration Portal and go to Service Settings.
In the right hand box choose 'New distribution list' and give your distribution list a name. The display name will be shown in the Global Address Book and the alias is the email address. In this case - we are choosing 'sales'. We are also going to allow people outside of our organization to send mail to this distribution list.
Choose the users that you want to add to the list. Then choose next and finish. You will get confirmation that the list creation was successful.