.net core 发送邮件

　　　var message = new mimemessage();
            //发送方
            message.from.add(new mailboxaddress("liyy", "xxxxx.com"));
            //接受方
            message.to.add(new mailboxaddress("mrs. li", "xxxxx.com"));
            //标题
            message.subject = "周末去哪嗨？";
            //文字内容
            message.body = new textpart("plain") { text = "上海一日游" };
            //开始发送
            using (var client = new mailkit.net.smtp.smtpclient())
            {
                client.servercertificatevalidationcallback = (s, c, h, e) => true;

                client.connect("smtp.live.com", 465, true);

                client.authenticationmechanisms.remove("xoauth2");

                client.authenticate("发送方邮箱", "发送方邮箱smtp授权码");

                client.send(message);
                client.disconnect(true);
            }