StringBuilder emailMessage = new StringBuilder();
emailMessage.Append("Dear Payment Team ,");
emailMessage.Append("<br><br>Please find the Payment instruction");
try
{
MailMessage Msg = new MailMessage();
// Sender e-mail address.
Msg.From = new MailAddress("pqr@gmail.com");
// Recipient e-mail address.
Msg.To.Add("abc@gmail.com");
Msg.CC.Add("zcd@gmail.com");
Msg.Subject = "Timesheet Payment Instruction updated";
Msg.IsBodyHtml = true;
Msg.Body = emailMessage.ToString();
SmtpClient smtp = new SmtpClient();
//smtp.EnableSsl = true;
smtp.Host = ConfigurationManager.AppSettings["HostName"];
smtp.Port = int.Parse(ConfigurationManager.AppSettings["PortNumber"]);
smtp.Send(Msg);
Msg = null;
Page.RegisterStartupScript("UserMsg", "<script>alert('Mail has been sent successfully.')</script>");
}
catch (Exception ex)
{
Console.WriteLine("{0} Exception caught.", ex);
}
<appSettings>
<add key="HostName" value="The host name as given by my company" />
<add key="PortNumber" value="25" />
</appSettings>
我一直在尝试更改指定的端口号，但没有成功
System.Net.Mail.SmtpException was caught
Message=Failure sending mail.
Source=System
StackTrace:
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at PAYMENT_DTALinesfollowup.Sendbtn_Click(Object sender, EventArgs e) in d:\AFSS-TFS\AFSS\Code\ERPNET\PAYMENT\DTALinesfollowup.aspx.cs:line 488
InnerException: System.Net.WebException
Message=Unable to connect to the remote server
Source=System
StackTrace:
at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout)
at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback)
at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback)
at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.GetConnection()
at System.Net.Mail.SmtpClient.Send(MailMessage message)
InnerException: System.Net.Sockets.SocketException
Message=A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 125.63.68.148:25
Source=System
ErrorCode=10060
NativeErrorCode=10060
StackTrace:
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
InnerException:
答案 0 :(得分：5)
您需要为smtp提供用户名和密码。
使用以下代码： -
MailSettings.SMTPServer = Convert.ToString(ConfigurationManager.AppSettings["HostName"]);
MailMessage Msg = new MailMessage();
// Sender e-mail address.
Msg.From = new MailAddress("pqr@gmail.com");
// Recipient e-mail address.
Msg.To.Add("abc@gmail.com");
Msg.CC.Add("zcd@gmail.com");
Msg.Subject = "Timesheet Payment Instruction updated";
Msg.IsBodyHtml = true;
Msg.Body = emailMessage.ToString();
NetworkCredential loginInfo = new NetworkCredential(Convert.ToString(ConfigurationManager.AppSettings["UserName"]), Convert.ToString(ConfigurationManager.AppSettings["Password"])); // password for connection smtp if u dont have have then pass blank
SmtpClient smtp = new SmtpClient();
smtp.UseDefaultCredentials = true;
smtp.Credentials = loginInfo;
//smtp.EnableSsl = true;
//No need for port
//smtp.Host = ConfigurationManager.AppSettings["HostName"];
//smtp.Port = int.Parse(ConfigurationManager.AppSettings["PortNumber"]);
smtp.Send(Msg);
答案 1 :(得分：2)
首先，您无需手动读取.config文件中的值。您可以在System.Net部分中进行设置，您的SmtpClient对象将自动读取它们：
<system.net>
<mailSettings>
<smtp from="Sender's display name <sender_email@domain.com>">
<network host="mailserver.yourdomain.com" port="25" userName="smtp_server_username" password="secret" defaultCredentials="false" />
</smtp>
</mailSettings>
</system.net>
然后，从您的代码中，您只需写下：
SmtpClient smtp = new SmtpClient();
MailMessage mailMessage = new MailMessage();
mailMessage.To.Add(new MailAddress("recipient@somedomain.com", "Recipient Display Name"));
mailMessage.Subject = "Some Subject";
mailMessage.Body = "One gorgeous body";
smtp.Send(mailMessage);
回到你的错误，你可能会遇到某种网络问题。
答案 2 :(得分：0)
我建议您使用Elmah在异常时发送电子邮件的最简单方法。请按照此指南获取解决方案： https://www.stormconsultancy.co.uk/blog/development/tools-plugins/setup-email-alerts-from-elmah-when-exceptions-are-raised/
答案 3 :(得分：0)
try
{
MailMessage mail = new MailMessage();
//SmtpClient SmtpServer = new SmtpClient("smtp.google.com");
SmtpClient SmtpServer = new SmtpClient(sServer);
// SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com", 587);
mail.From = new MailAddress(sFromEmailId);
mail.To.Add(sToEmailId);
mail.Subject = sSubject;
mail.Body = sMessage;
mail.IsBodyHtml = true;
HttpFileCollection hfc = Request.Files;
for (int i = 0; i < hfc.Count; i++)
{
HttpPostedFile hpf = hfc[i];
if (hpf.ContentLength > 0)
{
mail.Attachments.Add(new Attachment(fupload.PostedFile.InputStream, hpf.FileName));
}
}
SmtpServer.Port = 587;
//SmtpServer.Host = "smtp.gmail.com";
SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.Credentials = new System.Net.NetworkCredential(sFromEmailId, sPassword);
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
ClientScript.RegisterStartupScript(this.GetType(), "Alert", "dim('Mail Sent Successfully..!');", true);
mail.Dispose();
}
catch (Exception ex)
{
ClientScript.RegisterStartupScript(this.GetType(), "Alert", "dim('Error in Sending Mail..!');", true);
}
答案 4 :(得分：0)
此异常的另一个原因可能是系统上安装了反病毒。这可能会禁止应用程序发送邮件。只需注意一个对话框，要求允许通过系统上的应用程序发送邮件。