Paid character Transfer

I have an account that ran out of time. I want to transfer that toon to another account under my name that has time. I am getting this error:

The character you are trying to transfer has mail in his or her mailbox, or inbound mail that hasn't arrived yet (possibly from a quest). Please wait until all inbound mail has arrived and make sure your mailbox is empty before trying again.

I can't log in there is no time left. I do not want to spend money for time when I will paying to transfer to an active account!