Can I assign more than one email address to a customer for sending invoices?

Yes. Here's how to do it:

1. Go to CRM, then select Companies.
2. Search for and click on the customer you want to edit.
3. Click Options on the left access menu.
   
4. Under Specify a different email address for invoices, enter the email addresses, separating each one with a comma.
   
5. Click Save.