"It seems that all the articles sent to me are resent back to my
provider.  I only want to post those articles which have been locally
generated at my site back to my news feed provider."

or "I feed a site named foo.bar, but it puts something besides foo.bar
in their Path: header"

Let's look at a typical Path: line:

Path: plts!sdl!newsgw.mentorg.com!uunet!gatech!howland.reston.ans.net!agate!barrnet.net!jfrank.com!usenet

As a post goes from system to system, each site prepends their sitename
to the line.  Usually a site uses their FQDN, but sometimes they register
something with the UUCP Mapping Project which makes sure no two sites use
the same name.  In the above, we see a couple FQDN's and a couple sites
that are registered with the UUCP Mapping Project.

INN will not feed this article to any feed who's name appears in the Path:
header.

Suppose you have a feed to/from barrnet.net that looks like this:

netnews.barrnet.net:*,!control,!junk:Tf,Wnm:

This means "send all newsgroups except control and junk, but not if the
Path: line includes 'netnews.barrnet.net'".  That's fine, but as we see
in the above Path: example, BarrNet puts "barrnet.net" in the path,
even though their netnews machine is called "netnews.barrnet.net".

Therefore, we change the newsfeeds file to include a "/barrnet.net"
which means "exclude posts that have gone through barrnet.net".

netnews.barrnet.net/barrnet.net:*,!control,!junk:Tf,Wnm:

Now you won't feed to netnews.barrnet.net articles that have already
gone through barrnet.

The best way to solve this problem is:
	1.  Read the Path: line from an article that has passed
		through that site already.
	2.  Insert that sitename into the feeds description in newsfeeds.
	3.  "ctlinnd reload newsfeeds fixed_feed"

OTHER USES:

Suppose two sites have very reliable NNTP feeds from uunet and psinet
but still want a feed between each other to increase redundancy.  They
might set up feeds like:

othersite/uunet,uupsi:...

so that they aren't sending articles that have already reached two of
the biggest sites on Usenet (and therefore must have gotten good
distribution already), but will pass on everything else.

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