Managely gives its users the ability to automatically have all invoices delivered to multiple recipients.
Managely allows the users to set up an account to automatically send all invoices to multiple recipients by using the Contacts feature.
To set up multiple recipients to receive all invoices, access the customer’s account and then the Contacts tab below.
Click "Add New Contact":

Fill out the fields, and toggle on all three options:

Click "Save".
Next time an invoice gets created/generated, the email specified under Contacts will receive an emailed copy.