Did you try various "-merge" options in "mailutil transfer"?
Neither "-merge prompt" nor "-merge append" seemed applicable. I tried "-merge suffix=.alt" but it did not work. Suppose I have source folders "foo" and "foo/bar", with messages in both. Near as I can tell from the "-verbose" output, the order of events is something like the following:
1. Create destination folder "foo" as a file, not a directory. 2. Copy messages from source folder "foo" to destination folder "foo". 3. Attempt to create destination folder "foo/bar". 4. Receive error from destination server. 5. Attempt instead to create destination folder "foo/bar.alt". 6. Again, receive error from destination server. 7. Prompt the user for an alternate name.
Without "-merge suffix=.alt", the same events occur up through step 4. In neither case am I able to complete the transfer without manual human intervention. :-(
