note 117635 deleted from function.mail by cmb

Note Submitter: zhao_shiya at 126 dot com ---- Note that when header contains html which is too long, use "\n" to break lines manually. 如果header中的HTML太长的话，要手动加上"\n"，否则可能渲染错误。 比如"<div><span>abc</span></div>"可能成"<div><span>abc</ span></div>"