### Release 8.6.0 ¶

- `nncp-xfer` checks if locally copied packet’s checksum differs from the source’s one.
- `nncp-call` has bad return code if its queues contain unfinished jobs.
- `nncp-ack` command appeared, that sends explicit packet receipt acknowledgement (ACK packet). That acknowledgement deletes referenced packet from the outbound spool.
- Ability to turn `fsync` operation off using `$NNCPNOSYNC=1` environment variable.
- Added various indices in documentation, that should help searching in it.