The documentation warns against using decode_mimewords in scalar context. In fact, it suggests against using decode_mimewords in favour of unmime in MIME::WordDecoder.

If you were to use decode_mimewords, seems to me the proper usage would be: 

my $subj = '';
foreach (decode_mimewords($mail->get('Subject'))) {
   my ($data, $charset) = @$_;
   if (defined($charset)) {
      $subj .= decode($charset, $data);
   } else {
      $subj .= $data;
   }
}

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In reply to Re: reading Base64 encoded Unicode email returns mangled text by ikegami
in thread reading Base64 encoded Unicode email returns mangled text by Errto

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