I did like this and is working perfectly. From the left bar, click on Team and then under Workstations you have Mail Accounts. There you can create the Mail Group and select inside the group the Mail accounts you want to receive the mail alert when somone make an order from your app.
Ah, and finally you have to assign the Mail Group to the workstations. You can do from the left sidebar, click on workstations, click the workstation where you want to assign the Mail Group, select edit and then you can see in the tabs the section E-Mail. Select your mail group under "Send orders to this mail accounts" and you're done.