For slrn to mark an article as read in more than one group, it needs
    information about what groups the article was cross-posted to.  This
    information is provided by the Xref header.  Not all servers provide
    this header so this feature will not work with those servers.

    Now suppose that your server provides the Xref header as one of the
    headers of the article and at the same time, provides support for the
    NOV database (via the XOVER nntp command).  In this case, unless the
    server has been configured to provide the Xref header as part of the NOV
    database, slrn will not be able to get the header without accessing the
    article.  Unfortunately, Xref is optional under NOV so many systems do
    not automatically provide it even though it is one of the recommended
    headers.

    To summarize, make sure that your server provides the Xref header AND if
    it supports NOV, make sure that the Xref header is part of the NOV
    database.


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