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I'm working on a new version of Xfguestbook to prevent this problem.
- against spam done manually, I think include a "nofollow" in the url of message, with a warning in the form.
I don't want hack the core, and the solution is perhaps to replace the line 92 in xfguestbook/include/functions.php with
$a_msg['message'] = str_replace('target="_blank"','target="_blank" rel = "nofollow"', $onemsg->getVar('message'));
- against spam done with script, an adaptation of
this hack of D.J. (human recognition of a random code)
