See also: https://github.com/rgrove/larch https://github.com/rgrove/larch - "Larch is a tool to copy messages from one IMAP server to another quickly and safely

See also: https://github.com/rgrove/larch https://github.com/rgrove/larch - "Larch is a tool to copy messages from one IMAP server to another quickly and safely. It’s smart enough not to copy messages that already exist on the destination and robust enough to deal with interruptions caused by flaky connections or misbehaving servers."