The ideas listed here have already been implemented by GMX.

implemented
Vote
2
points
Facebook contact import wizard is not working Posted by LEO to Miscellaneous, 22 Apr 10 at 17:20
Facebook contact import wizard is not working [....]
implemented
Vote
157
points
Plain Text feature Posted by HarrytheSmith to Mail-Features, 6 Apr 09 at 11:44
Hello again,

I am also missing a plain text feature. Not everybody needs HTML, or do they?... I don't. Hopefully you can add that.

With kind regards,

Adam Smith [....]
implemented
Vote
62
points
Attachments handling! Posted by andy to Mail-Features, 4 Feb 09 at 17:01
On occasions there are a lot of files in a single message. It can be burdensome to save these one by one. Therefore you should add a function with which the user can simply download all of the attachments with one click. [....]
implemented
Vote
42
points
Please reduce the size of the logo/banner on top of mail Posted by Joe163 to Design, 7 Aug 09 at 15:04
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. [....]
implemented
Vote
77
points
cross browser support Posted by kai666 to Support, 3 May 09 at 21:34
Please make GMX compatible accross all browsers, like all the main email providers do. Not just for the 3 browsers favoured by GMX. If yahoo,aol, googlemail, hotmail and many smaller providers can have cross browser support, why can't GMX? [....]
implemented
Vote
16
points
No pop-up window/"Are you sure?" on Log out. Posted by ano to Design, 1 Dec 09 at 10:23
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. [....]
implemented
Vote
89
points
Colour-Themes Posted by andy to Design, 31 Mar 09 at 10:19
GMX should add more colours to their themes eg. Orange, red, black etc. Those available are becoming dull. [....]
implemented
Vote
8
points
Allow sending BCC: only Posted by Tam to Mail-Features, 1 Sep 09 at 19:34
I prefer to send all my messages using BCC: only so that my friends email addresses are not harvested when a message gets forwarded. The GMX system requires an entry in the TO: field before the message will send. I find this aggravating and it will limit my use of GMX. Should be a simple programing change to eliminate the verification of the TO: line. [....]
implemented
Vote
452
points
CUT and PASTE Posted by Innovation to Settings, 22 May 09 at 20:57
I really think it is about time that GMX allowed us to copy and cut text by left clicking with the mouse. [....]
implemented
Vote
34
points
In Inbox, checkbox can be added adjacent to every message Posted by sviswanath to Design, 4 Jul 09 at 07:37
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. [....]