If its like Drafts, though you can't share it through the UI, you can share it via the command line. Example (with user1 being the source and user2 being the destination):
zmmailbox -z -m user1@domain mfg /Trash account user2@domain rwixd
zmmailbox -z -m user2@domain createMountpoint /user1Trash user1@domain /Trash
P.S. If this isn't what you're looking to do - can you clarify?
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Paul Chauvet
State University of New York at New Paltz
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