def to_mail_subject(str)
      Jpmobile::Util.fold_text(Jpmobile::Emoticon.unicodecr_to_utf8(str)).
        map {|text| "=?#{mail_charset}?B?" + [to_mail_encoding(text)].pack('m').delete("\n") + '?=' }.
        join("\n\s")
    end
def to_mail_subject(str)
      Jpmobile::Util.fold_text(Jpmobile::Emoticon.unicodecr_to_utf8(str)).
        map {|text| "=?#{mail_charset}?B?" + [to_mail_encoding(text)].pack('m').delete("\n") + '?=' }.
        join("\n\s")
    end
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