If you received the 'Recipient could not be found' message when trying to send out an invoice, it means there's something wrong with the sending settings or the recipient's email address. Let's examine the most common reasons for this issue.

After receiving the error message, the first thing to do is check your billing settings. If you haven't checked any of the We'll email invoices options under Settings/Billing Settings/Billing Rules, the system will consider that there is no recipient for the e-mail containing the invoice.

If the option is enabled but you still get the error message, it means the recipient (company, billing person, or both) does not have an email address. You must open their profile and add an e-mail address to successfully send the invoice.