Content-Type: multipart/mixed; boundary="0123456789abcdefghijklmnopqrstuvwxyzABCDEFLMNOPRSTUVWXYZ'()+_,-./:=? "
multipart
Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit
Text body --0123456789abcdefghijklmnopqrstuvwxyzABCDEFLMNOPRSTUVWXYZ'()+_,-./:=? The above line is similar to the boundary but miss a final space, so it should be part of the body.
epilogue