The custom mail addresses service is an extra free feature that we serve to all our customers. You can activate it for free from HERE. The domain name that is connected with these mailboxes still remains under your ownership as well as the rights and the privacy of your mailboxes. We only reserve the administration rights in cases that you need to retrieve lost passwords, to change your company's email policy and to set up automated responses. The email service is powered by Zoho Ltd. and with the email addresses you gain access to all the G Suite Zoho services that includes collaboration software, office software etc. If you need to pay extra for any of Zoho services that aren't in this packet explained above, it's your responsibility to set up and handle the fees for this service.