Hello there, ethoshcs.

We have an option to set default email addresses for BCC. Here's how:

1. Click the Gear icon in the upper-right corner and select Account and settings.
2. Select the Sales tab and go to the Messages section.
3. Select a Sales form (Invoice).
4. Enter the email address in the Blind Copy (Bcc) new invoices to address field.
5. Click Save and Done.

However, setting the Bcc option per client is not yet possible. You'll need enter the email address manually in the Bcc field when creating the client's transactions.

1. Click the + New button in the upper-left and select Sales receipt or Invoice.
2. Below the Customer email field, click the Cc/Bcc hyperlink.
3. Enter the email addresses and click Done.
4. Enter the transaction details.
5. Click Save and close.

Feel free to get back to us if you need anything else. Have a great day!