Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!elroy.jpl.nasa.gov!ucla-cs!ucivax!orion.oac.uci.edu!ucsd!brian
From: brian@ucsd.Edu (Brian Kantor)
Newsgroups: news.software.nntp
Subject: Re: Nntp-Posting-Host line
Message-ID: <35290@ucsd.Edu>
Date: 7 Jun 91 12:51:45 GMT
References: <1991Jun6.100037.7232@st_nik!swindon.ingr.com>
Organization: The Avant-Garde of the Now, Ltd.
Lines: 20

The NNTP-Posting-Host: header line comes from sites running later
versions of nntp, and it there to help discourage spoofing of news
articles.  The nntp server which accepted the article with a POST
command is responsible for adding that header line (and eliding any
such which may be received in the article to be posted), so that
if an article needs to be tracked down, where it entered the news
system can be identified.

It is clearly not incorruptible, but it can help.

If you are not using nntp to post (not transfer, POST) articles, you
don't need it.

No, it's not in any standard.  Too new (about a year ago) for that.

	- Brian

PS: I'd have replied to the original question by mail, but the poster's
news posting software is putting out buggered From addresses and I
can't reply to them.