muchsync - 5-1 main

Muchsync brings notmuch to all of your computers by synchronizing your
mail messages and notmuch tags across machines. The protocol is heavily
pipelined to work efficiently over high-latency networks such as mobile
broadband.
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Muchsync supports arbitrary pairwise synchronization among replicas. A
version-vector-based algorithm allows it to exchange only the minimum
information necessary to bring replicas up to date regardless of which
pairs have previously synchronized.