You should put a real address there. =) If the word is real important, try making up an address with name and letting the important word (e.g. testing) be the "name" of the user. Make your MTA happy and your MTA will still drive you nuts... but at least you'll be doing it correctly!

 $mailer->open({
      From    => "$from <root\@place.dom>",
      To      => $to,
      Subject => $subject,
  });
## or
 $mailer->open({
      From    => "$from <$from\@place.dom>",
      To      => $to,
      Subject => $subject,
  });
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