If more than one notification arrives, they seem to all have the same ID, as the mark as read and open actions lead to the first email that arrives

Synchronously loading Mails causes the app to freeze. This will create a lot of problems when a lot of mails are processed

The Code is horrendous, it should be changes

This will obviously take a while

users can create custom folders, the app should read them on startup and create menu entries for them so the user can access them