I am automating the saving of e-mails and their attachments.

One thing I have came across is that the attachments collection includes embedded things (images for example). I've seen a couple of ways of handling this:

check the file extension
check the file size
use the proptag to determine real attachments

However, neither work for me because I only want to exclude signature images. I've seen signature logos that are bigger than some of our PDF files. If an e-mail contains an actual inline image that is part of the content of the e-mail (a screenshot for example), that should be included in the attachments collection. If any image is actually properly attached, that too should be included in the attachments collection.

We deal with technical drawings and they could equally be embedded or attached. Is this possible?