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Undoing

VM provides a special form of undo which allows changes to message attributes to be undone.

Typing C-x u or C-_ (vm-undo) undoes the last attribute change. Consecutive vm-undo's undo further and further back. Any intervening command breaks the undo chain, after which the undos themselves become undoable by subsequent invocations of vm-undo.

Note that expunges, saves and message edits are not undoable.

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