#!/usr/bin/perl

use WWW::Google::Groups;
$agent = new WWW::Google::Groups(server => 'http://groups.google.com');
$group = $agent->select_group('news.admin.net-abuse.sightings');
$threshold = $ARGV[0] || 20;
$cnt = 0;
open $blacklist, ">blacklist";
open $blacklist_log, ">blacklist_log";
while( $thread = $group->next_thread() ){
    while( $article = $thread->next_article() ){
        $body = $article->body();
        if($body =~ /^From: .+$/mo){
            if( $& =~ /[\b<](.+?@.+)[\b>]/o ){
                print {$blacklist} $1,$/;
                $cnt++;
            }
            print {$blacklist_log} join( q/ /, $thread->title(), '=>', $1),$/;
        }
        last;
    }
    last if $cnt >= $threshold;
}