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Niceness

Each transmitted packet has niceness level, as Unix has nice command for controlling processes priority. Higher nicer level means that packet is "nicer" and allows other to bypass him – that means lower transmission precedence.

Send big files with higher nicer level! That will guarantee you that higher priority packets, like mail messages, will pass first, even when lower priority packet was already been partly downloaded.

There are default niceness levels built-in for nncp-mail, nncp-file and nncp-freq commands. But pay attention that it can give information about underlying payload to the adversary!