c#调用qq邮箱smtp发送邮件修改版代码分享

 try
            {
                mailmessage mm = new mailmessage();
                mailaddress fromma = new mailaddress("[e-mail]");
                mailaddress toma = new mailaddress("[e-mail]", null);
                mm.from = fromma;
                //收件人
                mm.to.add("[e-mail]");
                //邮箱标题
                mm.subject = "hello dear:";
                mm.isbodyhtml = true;
                //邮件内容
                mm.body = "你好mr流星！";
                //内容的编码格式
                mm.bodyencoding = system.text.encoding.utf8;
                //mm.replyto = toma;
                //mm.sender =fromma;
                //mm.isbodyhtml = false;
                mm.deliverynotificationoptions = deliverynotificationoptions.onsuccess;
                mm.cc.add(toma);
                smtpclient sc = new smtpclient();
                networkcredential nc = new networkcredential();
                nc.username = "[e-mail]";//你的邮箱地址
                nc.password = "zzzzz";//你的邮箱密码,这里的密码是[e-mail]邮箱的密码，特别说明下~
                   sc.usedefaultcredentials = true;
                sc.deliverymethod = smtpdeliverymethod.network;
                sc.credentials = nc;
                //如果这里报mail from address must be same as authorization user这个错误，是你的qq邮箱没有开启smtp，
                //到你自己的邮箱设置一下就可以啦！在帐户下面,如果是163邮箱的话，下面该成smtp.163.com
                sc.host = "smtp.qq.com";
                sc.send(mm);

            }
            catch (exception ex)
            {
                throw new exception(ex.message);
            }

这个是我用我的2个qq测试成功了的，有问题希望各位指正~~