OCR on PDF files attached to e-mails?

[cgrunenberg]

You could use this script:

Extract image files from formatted notes?

A script converting the notes to rich text first should actually work: tell application id "DNtp" set theSelection to the selection set tmpFolder to path to temporary items set tmpPath to POSIX path of tmpFolder repeat with theRecord in theSelection try if type of theRecord is formatted note then set theRTF to convert record theRecord to rich if type of theRTF is rtfd then set thePath to path of theRTF set theGroup to parent 1 of theRecord tell application "Fin…

However, this requires at least DEVONthink Pro 3 and in case of lots of messages might run for a while.