How to delete attachments in Google Mail / GMAIL without deleting the original e-mail
I've been looking for such a solution, but either it was not working at all or way too complicated
On this page I've found a new solution: http://techawakening.org/delete-attachments-from-gmail-without-deleting-the-emails/1842/#comment-25815
OK - it has some limitations again (e.g. your original (e-mail) time-stamp will be changed), but it was working for me from the beginning and it takes just a few minutes to read the instructions and make the needed set-up.
Unfortunately the creator of this solution has described the whole thing three times in a row in the same blog entry and the real instructions are somehow hard to find, so I copied it 1:1 to here (hope it's fine - otherwise just let me know).