How come my emails are not getting the notifications?

Hello. For the recipient email, I added 3 emails. But once I check the notification email, I only see one email that it was sent to. Please advise. 

Thank you for contacting us.

Let me please inform you, that the custom sender e-mail option works with separate emails. In other words, it does not list all the recipients in the 'To:' field.

According to our logs, your test submission was properly emailed to specified recipients.

Please feel free to contact us if you need any further assistance.