To reduce the size of the PDF files, simply tweak the output settings in the Easy Document Creator. You're probably using high quality settings and that's why the file sizes are so high. For PDF files, simply use 300 or 600 DPI for scanned documents, but 300 should be just fine and they're also print ready.
At these settings, the file should look just fine without any issues and the size will be compatible with most of the email services.