You can set by following these steps:
· Select the Accounts tab and then the "+" button to create a new account.
· Enter your e-mail address and password.
· Choose POP as the server type and pop.gmx.com as the incoming e-mail server. Then press the Continue button.
· Set the outgoing e-mail server to mail.gmx.com.
· Examine all of the data you've entered..
· If you wish to keep copies in your GMX mailbox, go to the Advanced tab and choose your GMX mailbox.