Jordyboy9:
Spam filters sometimes need a little help to decide what is, and isn't spam. (After all, maybe you actually want to receive those emails offering to enlarge your manhood!).
If you find a 'wanted' email in your Spam folder, click on it to open it and then click on 'Not Spam'. GMX will move the message to your Inbox and, importantly, 'whitelist' the sender, so that future mail from them is no longer directed to the Spam folder.
You can also 'whitelist' (and 'blacklist') email addresses and domains manually by clicking on 'Settings' at the bottom left of the page (and then on 'Whitelist' or 'Blacklist').
By default, Spam items are kept for 30 days, so anything that accidentally goes into your Spam folder isn't going to disappear quickly; you'll still have plenty of time to spot it. You can change the default storage times for folders, if you wish, by going to 'Settings' and then to 'Folder Overview'.
There are other features available from 'Settings' that you might care to explore, such as the Autoresponder facility (which lets you automatically acknowledge all incoming mail, perhaps with a message to say [for example] that you'll be away from your desk for a few days).