Here’s the applescript I use to process specific email messages
Click to see script (click for more details)It makes use of the Add message(s) & attachments to DEVONthink
script supplied by Devonthink,
and creates a group for the email and attachments in the Global Inbox
I use a group for the original email and attachments
PDF files retain some metadata internally
This can be viewed using Preview/Inspector
For example