Checkout Wizard values for $RecipientEmail

I used the Checkout Wizard to creat by checkout pages and on the confirm.php page I have included in the UE SB the following:

$RecipientEmail = "".((isset($_SESSION["eCartCheckoutForm_firstname"]))?$_SESSION["eCartCheckoutForm_firstname"]:"") ." ".((isset($_SESSION["eCartCheckoutForm_lastname"]))?$_SESSION["eCartCheckoutForm_lastname"]:"") ."|WA|".((isset($_SESSION["eCartCheckoutForm_email"]))?$_SESSION["eCartCheckoutForm_email"]:"") ."";include("WA_Universal_Email/WAUE_confirm_2.php");

With this code my testing server never sends out the order email.
However, if I change it it like so:

$RecipientEmail = "".$_SESSION['eCartCheckoutForm_email'] ."";include("WA_Universal_Email/WAUE_confirm_2.php");

It works fine. Is there some additional code needed in the setup of the recipient name/email ?
Thanks.

The code generated by the checkout wizard will try to format the to address as:
FirstName LastName <Email@Address.com>

There are some server that will not accept this format and will only accept:
email@address.com

it looks like your SMTP server does not like the :
FirstName LastName <Email@Address.com>

format.

Thanks for the clarification Jason.
I will try it out on the production server.
Best Regards,

You're welcome.