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