Net::NNTP has a method
newnews which takes as it's first parameter a time value to get new news since that time. I found this out with the Net::NNTP documentation. There is an online version
here. In the future. It also helps to post some code so that we can get a feel for what you are working on, and where you might be messing up. More than one smart cookie hangs their monkly robes here, so code is a good first step. Good luck.
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jb