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Yes, error 4000 is terrible! I wrote about it here http://ideajam.net/IdeaJam/P/ij.nsf/0/2297DB0DE35E466C8825791F002F88F5?OpenDocument , but little has changed since then...
This platform is supposed to be used for ideas and improvement requests. While I suggest to open a support ticket, I think your idea here is a request to 'provide a documentation for NotesDocument.CancelSendOnMissingKey'