Are you looking for a way to grant permission to portal users using e2a Community User Permission Set? Here's a step-by-step guide on how to do it.
Setup | Manage Users | Users | Your User | Assign Licenses

Installed Packages | Ortoo:Email-to-anything | Manage Licenses | Add Users

Setup | Manage Users | Users | Your User | Edit Assignments

Please contact us at support@ortooapps.com for any questions.