You don't show us what kind of problems you have, so it is hard to suggest how to proceed.

Have you looked at the demos included with Net::NNTP, especially the nntp sample? Maybe you just want to do the same, except save things into a file?

The following gives you information about the kind of data structure returned by ->article. Handling that data structure is likely best done through References Quick Reference.

...
use Data::Dumper
print Dumper $nntp->article( $last );
...
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Thanks for the references.Those would definitely help at some point or other. Now, I am able to do the required task with the following code

open(ARTICLE,">>indexer.txt") or die "Cannot open indexer.txt";
    my $data=$nntp->article(99);
    print ARTICLE @$data;
    #print ARTICLE "Completed Successfully";
    close(ARTICLE);
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However, I want to know if there is a better way to do it using the file handle that the article() function returns. As for data dumper, it does the task as well, but the output is in pretty untidy format. And the problem I am facing is that I do not know how to use tied filehandles. Any code snippet would be highly appreciated

You can treat a (tied) filehandle just like any other filehandle. It acts like a filehandle, but maybe its data does reside in memory or somewhere else. As a consumer of data, you usually don't need to care about this.

...
my $fh= $nntp->articlefh(...);
while( <$fh>) {
    print "Article: $_\n";
};
...
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open($article, ">>", indexer.txt") or die $!;

$nntp->article($last, $article);
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Your syntax (<FH>) would use the <> operator to try to read from the file handle and pass the result as an argument, rather than pass the actual file handle.