利用SmtpClient发送邮件

1  163邮箱 HOST:smtp.163.com

public static string CreateTimeoutTestMessage(string server)
        {
            string Success = "发送成功";
            try
            {
                string _to = "[e-mail]";
                string _from = "[e-mail]";
                string _subject = "Using the new SMTP client.";
                string _body = @"Using this new feature, you can send an e-mail message from an application very easily.";
                MailMessage message = new MailMessage();
                message.From = new MailAddress(_from);
                //可以利用MailMessage.To.Add方法增加要发送的邮件地址
                message .To .Add (new MailAddress ("[e-mail]"));
                message.To.Add(new MailAddress(_to));
                message.Subject = _subject;
                message.Body = _body;  

                //添加附件
                Attachment a = new Attachment(@"C:/Users/Administrator/Desktop/smtpclient.rar");
                message.Attachments.Add(a);
                //设置邮箱的地址或IP
                SmtpClient client = new SmtpClient(server);
                //设置邮箱端口，pop3端口:110, smtp端口是:25
                client.Port = ;  

                //设置超时时间
                client.Timeout = ;  

                //要输入邮箱用户名与密码  

                client.Credentials = new NetworkCredential("[e-mail]", "******");
                client.Send(message);
            }
            catch (Exception ex)
            {
                Success = ex.ToString();
            }
            return Success;
        }  

2 QQ邮箱

QQ邮箱默认的SMTP服务是关闭的，要自己去开通。

HOST:smtp.qq.com

try
            {  

                SmtpClient client = new SmtpClient();
                client.Host = "smtp.qq.com";
                MailMessage mm = new MailMessage();
                client.Port = ;  

                mm.From = new MailAddress("[e-mail]");
                mm.To.Add(new MailAddress("[e-mail]"));
                mm.Subject = "Hello~!";
                mm.Body = "HIthere.here is a post ";
                mm.IsBodyHtml = false;
                mm.Priority = MailPriority.High;  

                client.Credentials = new NetworkCredential("[e-mail]", "******");
                client .Send (mm);  

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }