For the confirmation page, I just fixed "1) - edit the store order details behavior not to redirect."
("2)" - left it as it was as I'd set the "postcode" to stores email address when I initially created the site.)
Also, I deleted "the mail_php.php" and "mailformatting_php.php" files, then went back to the UE server behavior to regenerate those files, which was done for my contact.php file since you suggested to do this in another thread I posted.
Contact and confirm pages are in the same site, so not really sure if I just needed the former or both to fixed the problem for confirm page.
But it is sending emails with no problem.
Again, thank you for your help!