Yes, you can manage access to the webinterface for individual e-mail recipients (e-mail users) under Users & Permissions > Manage email users. They can log into the admin panel (https://login.europeanmx.eu) with their e-mail and password and manage their own settings. Adding and removing email users does not affect current email processing; this page is only used to manage individual accesses to the admin panel.
Under Users & Permissions > Manage permissions you can define which menu items are to be available to an e-mail user. Each menu item can be accessed via 4 possible HTTP methods.