[solved] Problem of receiving mail

[applexy3]

I recently install the IspCP Omega 1.0.7 into my Ubuntu 10.10 (Desktop) which runs in the VirtualBox, and most of its functions work well, such as ftp. But when I try to do the email marketing, although it tells me that the mail has been sent successfully, I can't receive the mail from the mailbox that I bind to the user. Neither can I find it from the default mailbox in the webmail. How I can fix that?