Very annoying that it needs to be that big. There is hardly any room for reading email.

And your response telling people to hit F11 is ridiculous, just fix it. [....]

Popups are extremely annoying and do not make for a good "feature"... Whenever I log out (I have the 'Remember Me' option enabled) there comes out a pop-out window telling me that I am still singed in and have the option to log out or exit...

There should be no pop-ups. Or they should become optional just as you did with the sign in pop-up window. Alternatively, you can place 2 buttons: Logout and close so the user has the option to either log out permanently or just close GMX while viewing the inbox and not through a pop-up. [....]

GMX should add more colours to their themes eg. Orange, red, black etc. Those available are becoming dull. [....]

In Inbox or any other mail folders, check boxes can be added adjacent to every message. It would make users to easily select messages and perform action like delete or move in one stroke. Currently we are able to perform this functions by ctrl and shift keys. Still this feature would enhance the user experience. [....]

It's much to large and wastes space in Webmail. This is the one that runs across the top of the page. [....]