Drinko Currently, Webmail isn't included in WordOps and there seems to be no planning for the same. I would recommend you to go with a 3rd party service like Zoho, G Suite, or MX Route for this purpose.
If you really want to do this on your own then you will need a separate server for the Webmail purpose. You can use
Mail-in-a-Box but the setup is pretty lengthy.
More Details: https://mailinabox.email/guide.html