@d19dotca Yes, this means that the app can be configured so that the admin can take total control of the mail configuration inside WordPress. See the "Optional Email Configuration" section in the latest release - https://blog.cloudron.io/cloudron-6-3-released/
If you configure WP as "Do not configure mail settings", then you can install another WP mail plugin and manage it entirely yourself. For example, you can also send emails directly via sendgrid/SES etc instead of via Cloudron mail server as well.