well, I checked the SMTP Server (which by the way I'm on a shared server) and everything looks fine. I confirmed again today that if we get more than 1 order on the same day, Universal Email will only email the order summary of the 1 1st order.
It's weird, because our contact oage, we use CDONTS to send email results, which will email everytime, regardless of how many a day we get.
With Universal Email, we use CDOSYS instead and works for the first order only, not the others...
I wonder if it has to do with CDOSYS!