http://forums.graalonline.com/forums...ditattachments
Not sure if this is a suitable alternative, but why not just add a cap on space for your account? You would have X amount of space total, and you could have space for all your private messages, but it would come at the cost of having less attachments.
If you were to remove images that are old (Some people could have them dating back for years) it might free up a lot of space, but space may not be an issue (Space as far as room for data on the overall forum)
Quote:
Attachment Statistics
You are currently using 405.7 KB to store 11 uploaded attachments.
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Your messages could be included in that overall space.