Automatic attachment extraction.

If someone sends a message to a list and there's a jpg attached, is there 
a way to automatically save the jpg to a directory and place the new 
resulting URL into the text of the message that goes out?

The list in question is set up to remove all attachments and convert 
everything to plaintext.

I don't even know if this is something mj2 should even know about or if 
there's a different package I should be using.

TIA

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