Hello, is it not possible to do this? I tried including a PB in the subject line of a delivery and nothing rendered. I copied/pasted the code from the PB into the subject line instead, and it DID render. This leads me to believe it's not possible (even though it lets you) to use a PB in the subject line of a delivery, but I'd like to get confirmation of that (haven't been able to find anything in my searches thus far). Thank you in advance for your help!