asp.net core 使用MailKit 发送邮件。

使用MailKit需要安装

发送邮件需要开启smtp，我是用的QQ。可以参考http://jingyan.baidu.com/article/0f5fb099dffe7c6d8334ea31.html

            var message = new MimeMessage();

            string  Email = "接收者邮箱";

            message.From.Add(new MailboxAddress(发送者));
            message.To.Add(new MailboxAddress(Email));
            message.Subject = "标题";

            var builder = new BodyBuilder();
            builder.HtmlBody = "";  //html
            builder.TextBody = "";  //文本
            message.Body = builder.ToMessageBody();
            var client = new SmtpClient();

            client.Connect(_settings.Value.EmailServer, _settings.Value.EmailPort, true);     //连接服务
            client.AuthenticationMechanisms.Remove("XOAUTH2");
            client.Authenticate(_settings.Value.EmailAddress, _settings.Value.EmailPassword); //验证账号密码
            client.Send(message);
            client.Disconnect(true);

 参考示例：http://www.mimekit.net/docs/html/Creating-Messages.htm