I get a strange problem.

Right now I have set up Send Copy of Order Confirmation Emails To my admin email address in Admin/email options. So I got email notification for every new order. This worked fine until yesterday. From yesterday on, I can't get Order Confirmation Email any more from my admin email. I have created a test user with another email address and made an order by this test user. In my test user email box, I got order confirmation email. But didn't get the copy of the mail from my admin email box.

I tested sending email directly to admin email address from admin/Tools and it works fine. More strange is that if I change test user email address to admin email address and made an order, then I can get two emails in my admin email box, one for uer and one is the copy for admin.

Anybody can help me out with this problem? What can go wrong? I can't figure out what's going on. Thank you in advance for your help.

Steve