Question / feature request: Protect newsletter browser view

Hello,

knowing a site runs WordPress and MailPoet, it is quite simple to browse through all newsletters (including drafts) by just entering “http://www.yoursite.com/?wysija-page=1&controller=email&action=view&email_id=1” in the browser and altering the value for email_id.

Is it possible to somewhat protect the newsletter browser view from being accessed by everyone like adding a campaign specific key to the url?

Thanks for your help.

https://wordpress.org/plugins/wysija-newsletters/