Hmailserver issue

Job ID: 34424901

Budget: $10 – $20 USD

I buy a Contabo VPS(windows), and installed hmailserver.

Everything works very well. I use Thunderbird to send emails, it works.
But, I can not receive e-mail.
Can any body tell me the way to fix it?
(Pls advise the method, and let me fix by myself so that I can learn.)
Related categories: Windows Server SMTP