multiple user emails

I need to have multiple emails for the same user…one to the person in the users order department and then also an email for user invoice/payment department. As of right now I have to forward the order confirmation to the user payments department so they get a copy of the invoice when the order is made.

I have tried multiple emails in user profile separated by a comma,,

but it gives me an error message “invalid input”

Please any help would be great…I am using version 2.10