//定义大字节存放类型StringBuilder StrBuiderMailtxt = new StringBuilder("");//解决HTML邮件出现的乱码问题StrBuiderMailtxt.Append("\r\n<tr><td> <hr></td></tr>\r\n");//在各HTML标记间加“\r\n”人工让HTML内容回车就会避免乱码问题 转载于:https://www.cnblogs.com/hanguoji/archive/2006/07/26/460423.html