My mailbox always ir empty

Most believable, that you have retrieved all your messages useing POP3 program, for example,Outlook, TheBat etc.

Unfortunately, it is not possible to return the deleted messages. You should check your Outlook or other POP3 client-program.

In case the message forwarding is set to other mailbox, all the messages should stay inside your mailbox.

Also possible, that someone got to  known your password and has deleted all your messages.
We reccomend to change the password and the answer to the secret question. 

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