利用SmtpClient发送邮件（转）

SMTP(Simple Mail Transport Protocol)简单邮件传输协议。在.NET Frameword类库中提供SmtpClient类(System.Net.Mail),她提供了一个轻型方法来发送SMTP电子邮件信息。SmtpClient类中的Bcc属性是用来指定此电子邮件抄送的收件人的集合，这就意味着可以为每个邮件制定多个收件地址。Attachmenty属性也是一个集合，可以使用它为邮件添加多个附件。 发送邮件中用的其他类主要还有

1．  Attachment类,表示文件附件，它允许将文本、流、文件附加到电子邮件中。

2．  MailAddress类，表示邮件地址。

3．  MailMessage类，表示电子邮件。

代码：

1  163邮箱 HOST:smtp.163.com

public static string CreateTimeoutTestMessage(string server)  
        {  
            string Success = "发送成功";  
            try  
            {  
                string _to = "1035092449@qq.com";  
                string _from = "young-20@163.com";  
                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 ("652105072@qq.com"));  
                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 = 25;  
                  
                //设置超时时间  
                client.Timeout = 9999;  
                  
                //要输入邮箱用户名与密码  
                  
                client.Credentials = new NetworkCredential("young-20@163.com", "******");  
                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 = 25;  
                  
                mm.From = new MailAddress("652105072@qq.com");                  
                mm.To.Add(new MailAddress("1035092449@qq.com"));  
                mm.Subject = "Hello~!";  
                mm.Body = "HIthere.here is a post ";  
                mm.IsBodyHtml = false;  
                mm.Priority = MailPriority.High;  
  
                client.Credentials = new NetworkCredential("652105072@qq.com", "******");  
                client .Send (mm);  
                 
  
            }  
            catch (Exception ex)  
            {  
                MessageBox.Show(ex.Message);  
            }