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.
In case you did not find your answer contact us