asp.net发送电子邮件问题?????
MailMessage mailObj = new MailMessage();
mailObj.From = new MailAddress("lz6e804@lisco.com.cn");//发信人地址
mailObj.To.Add("haoyuning@foxmail.com");//收信地址
mailObj.CC.Add("haoyuning@foxmail.com");//抄送地址
mailObj.Subject = "这里填写邮件标题2222222";//邮件标题
mailObj.Body = "这里是正文的内容2222222222222222222222";
//html格式的邮件
mailObj.IsBodyHtml = true;
////设置为高级优先权(可设可不设)
//mailObj.Priority = MailPriority.High;
//使用SmtpMail对象发送邮件
SmtpClient smtp = new SmtpClient("123.156.97.148");//服务器的地址
smtp.Send(mailObj);//发送邮件

运行以上代码（报错）：由于目标机器积极拒绝，无法连接。 123.156.97.148:25
怎么解决？？？？？


[解决办法]
是在什么环境下出现这种情况的，我之前遇到过类似的情况，但是是本机OK，放到服务器上就不行，原因是防火墙把25的端口关了
[解决办法]
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="subject">邮件标题</param>
/// <param name="content">邮件内容</param>
/// <param name="tomail">接收邮件地址</param>
protected void SendMail(string subject, string content, string tomail)
{
MailMessage objMailMessage;

// 创建邮件消息
objMailMessage = new MailMessage();
objMailMessage.From = rwWebConfig.readConfigValue("formemail");
objMailMessage.To = tomail;
objMailMessage.Subject = subject;
objMailMessage.BodyFormat = MailFormat.Html;
objMailMessage.Body = content;

objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
//用户名
objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", rwWebConfig.readConfigValue("username"));
//密码
objMailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", rwWebConfig.readConfigValue("password"));

//SMTP地址
SmtpMail.SmtpServer = rwWebConfig.readConfigValue("smtp");
//开始发送邮件
SmtpMail.Send(objMailMessage);
}
[解决办法]
参考这里
http://www.heycoder.com/noteinfo8.aspx
[解决办法]
1.QQ:

System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
msg.To.Add("xxx@xxx.com");
msg.From = new MailAddress("xxxxx@qq.com", "handyzhu", System.Text.Encoding.UTF8);
msg.Subject = "标题";
msg.Body = "测试";
SmtpClient client = new SmtpClient();
client.Credentials = new System.Net.NetworkCredential("164206528@qq.com","********");
client.Port = 25;
client.Host = "smtp.qq.com";
object userState = msg;

client.Send(msg);



2.163



public static string CreateTimeoutTestMessage(string server)
{
string Success = "发送成功";
try
{
string _to = "xxxx@qq.com";
string _from = "xxx@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 ("xxxx@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("xxxx@163.com", "******");
client.Send(message);
}
catch (Exception ex)
{
Success = ex.ToString();
}
return Success;
}
[解决办法]
///
/// 发送EMAIL
///
/// </summary>
///
/// <param name="from">发件人地址 </param>
///
/// <param name="password">密码 </param>
///
/// <param name="DisPalyName">对方收到时显示的名称 </param>
///
/// <param name="to">收件人 </param>
/// <param name="cc">抄送:默认为空 </param>
///
/// <param name="subject">主题 </param>
///
/// <param name="ssl">经过ssl加密 </param>
///
/// <param name="priority">邮件优先级:MailPriority.High </param>
///
/// <param name="isbodyhtml">是否HTML邮件 </param>
///
/// <param name="attachment">附件:没有则为null </param>
///
/// <param name="body">正文 </param>
/// <returns>返回值：如果为空则成功，否则失败 </returns>
public static string SendEMail(string from, string password, string DisPalyName, string to, string cc, string subject, bool ssl, MailPriority priority, bool isbodyhtml, Attachment attachment, string body)
{
MailMessage mm = new MailMessage();
mm.From = new MailAddress(from, DisPalyName, Encoding.UTF8);
mm.To.Add(to);
mm.SubjectEncoding = Encoding.UTF8;
mm.Subject = subject;
if (attachment != null)
mm.Attachments.Add(attachment);
if (cc != null && cc != "")
mm.CC.Add(cc);
//抄送
mm.IsBodyHtml = isbodyhtml;
//是否是HTML邮件
mm.BodyEncoding = Encoding.UTF8;
//编码
mm.Priority = priority;
// MailPriority.High; //优先级
mm.Body = body;
SmtpClient sc = new SmtpClient();
sc.Credentials = new System.Net.NetworkCredential(from, password);
//
sc.Port = 25;
sc.Host = "smtp." + from.Substring(from.IndexOf('@') + 1);
try
{
sc.Send(mm);
return "";
}
catch (Exception ee)
{
return ee.ToString();
}
}
/// <summary>
///

/// 发送EMAIL
/// </summary>
/// <param name="from">发件人地址 </param>
///
/// <param name="password">密码 </param>
///
/// <param name="DisPalyName">对方收到时显示的名称 </param>
///
/// <param name="to">收件人 </param>
///
/// <param name="cc">抄送:默认为空 </param>
///
/// <param name="subject">主题 </param>
///
/// <param name="attachment">附件 </param>
///
/// <param name="body">正文 </param>
///
/// <returns>返回值：如果为空则成功，否则失败 </returns>
///
public static string SendEMail(string from, string password, string DisPalyName, string to, string cc, string subject, Attachment attachment, string body)
{
return SendEMail(from, password, DisPalyName, to, cc, subject, false, MailPriority.High, false, attachment, body);
}