Jack Cuyler wrote:

According to the RFC, that particular header is generated server-side:

3.4.1 NNTP-Posting-Host

 This line is added to the header of a posted article by the server.
 The contents of the header is either the IP address or the fully
 qualified domain name of the client host posting the article.  The
 fully qualified domain name should be determined by doing a reverse
 lookup in the DNS on the IP address of the client.  If the client
 article contains this line, it is removed by the server before
 acceptance of the article by the Usenet transport system.

http://www.faqs.org/rfcs/rfc2980.html

Additionally, many, if not most, pay servers do not include this header
at all.

    Well, thanks for the info. That does not change the fact that I'd
still be interested in filtering on the basis of a missing field in
the header. Do you know how to do so?


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