Email的标题源码格式是:

“=?” + ENCODE + “?” + SUBJECT_DATA_TYPE+ “?” + ENCODED_SUBJECT_DATA + “?=”

  1. 以“=?”开头;
  1. 以 “?=”结束;
  1. ENCODE:编码;
  1. SUBJECT_DATA_TYPE:指邮件标题数据类型,可选值有B或者Q,B指Base64,Q指Quoted-printable编码
  1. ENCODED_SUBJECT_DATA:编码过后的邮件标题内容;

reference:http://www.realsoftware.com/listarchives/realbasic-nug/2003-04/msg02405.html