1 Content-Transfer-Encoding to 8bit, although that may violate a SHOULD
   1 Content-Transfer-Encoding: base64<br>
   2 Content-Transfer-Encoding: 
   2 Content-Transfer-Encoding:  7bit
   6 Content-Transfer-Encoding:7bit
  10 Content-Transfer-Encoding: 8Bit
  15 Content-Transfer-Encoding:quoted-printable
  19 Content-Transfer-Encoding: Quoted-printable
  22 Content-Transfer-Encoding: quoted-printable 
  36 Content-Transfer-Encoding: us-ascii
  58 Content-Transfer-Encoding: 7Bit
  62 Content-Transfer-Encoding: 7BIT
  68 Content-Transfer-Encoding: 8BIT
  88 Content-Transfer-Encoding: Quoted-Printable
  96 Content-Transfer-Encoding: binary
 125 Content-Transfer-Encoding: QUOTED-PRINTABLE
 135 Content-Transfer-Encoding: BASE64
6695 Content-Transfer-Encoding: 7bit;
13709 Content-Transfer-Encoding: base64
14614 Content-Transfer-Encoding: 8bit
92165 Content-Transfer-Encoding: quoted-printable
155825 Content-Transfer-Encoding: 7bit