I rarely look at headers, I look at size, if the size matches the installer size from the homepage (of the program) and an extra 30-60 mb for PAR's, then generally it's legit. You get more fakes from software than anything else....movies are the easiest to decide if there fake or real...
I personally use Newsleecher, it's in the NZB software section and it's fully working with super search, but it's to each his own.
Well here's everything about Usenet in guide form, go ahead and take a look around, it will answer alot of your questions.
http://www.binaries4all.com/
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