--- Mail#header
      إå Hash ֤
       'From''Subject' ʤɤΥե̾ǡ٤ƤΥ 
      String#capitalize [String] Ƥ롣

      ͤβԤϺ롣ʣԤʬƤ硢֤˲Ԥ
      Ϥ(³ԤɽϺ)MIME ǥɤʤɤԤ
       NKF ʤɤѤ뤳ȡ

