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There is possibility to explicitly acknowledge the receipt of the encrypted packet, by generating the reply of ACK-type which contains the packet identifier.

ACK packets can be generated explicitly by nncp-ack command, or during the tossing procedure if -gen-ack option is specified.

General workflow with acknowledgement is following, assuming that Alice has some outbound packets for Bob:

Similarly you can use it with nncp-bundle, but do not forget that by default it does not do checksumming of the packets, so you should either use its -check option, or run nncp-check after.

If you generate ACK packet during the tossing, then the list of ACK packets is saved as empty files directly in the spool. You can remove transferred ACK packets with nncp-rm -ack.