from what format are you converting to PDF? I ask because if it is one of the supported formats (txt,doc, images rtf etc) then you can simply "open" the file in the Editor, send it by email, then close the document without saving it.
It will be saved in the temp folder, however it is regularly 'cleaned' by Windows itself as I am sure you are aware. I suspect your current solution is doing something similar.
What I would suggest is to use the email capabilities of the printer itself. It used to be capable of creating the PDF, emailing it and then deleting the file. That functionality was removed in V7. It is being "resurrected" for the next build.
If you want to test this functionality - go to the previous builds of PDF-XChange Standard and install a test instance. https://www.tracker-software.com/versio ... e-standard