Hi Kay,

You are right - the process to restrict sending emails to particular customer does not seem to be working as advertised. Disabling the email checkbox on the Invoices tab when editing a Customer should be the way to do this.

In the meantime, if you remove the email address from the customer (and the invoice, if in a batch), this should be enough to not have emails sent from the queue, and you can delete them from the queue.

This has been forwarded to development. Thanks for bringing it to our attention.