How to configure the parameters in System.Net.Mail and send email?

Hi

I use System.Net.Mail to send email. But, it has error. The smtp ac does work when I use in outlook.

How should I set the parameters:

msg.ReplyTo = to;
msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure.ToString();

as it said the errors are not able to convert string to msg.ReplyTo and DeliveryNotificationOptions.


public void SendMailNow(string from, string to, string title, string content)
        {
            SmtpClient smtp = new SmtpClient(Host);
            if (IsUserCredentials)
            {
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = Credential;
            }
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            MailMessage msg = new MailMessage(from, to, title, content);
            msg.IsBodyHtml = true;
            msg.ReplyTo = to;
            msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure.ToString();
            msg.BodyEncoding = Encoding.GetEncoding(950); //936 - simplified chinese
            msg.SubjectEncoding = Encoding.GetEncoding(950); //950 - traditional chinese
            smtp.Send(msg);
        }

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techquesAsked:
Who is Participating?
 
REA_ANDREWCommented:
It is all to do with authentication.  You need to get all the ingredients correct to suit the SMTP Credentials of an Account you have with a provider.

If you cannot send on your home network, your details you are providing must be wrong.  BUT you have now been able to send you email using the System.Net.Mail through your friends network.  Which means we cannot really tell you why you cannot send on your home network as it is a bit beyond the scope of this topic area.  Or rather I could not tell you as I would have no idea what credentials you should use are.

If you can send email using an email client such as outlook from your home machine, then ring up your ISP and ask them for your SMTP details or query the account inside Microsoft Outlook Accounts.

Cheers,

Andrew

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REA_ANDREWCommented:
You are trying to assign a string to an enum

replace

msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure.ToString();

with

msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
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Éric MoreauSenior .Net ConsultantCommented:
this line:
msg.ReplyTo = to;

should read:
msg.ReplyTo = new MailAddress(to);

And REA_ANDREW already replied for the DeliveryNotificationOptions
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REA_ANDREWCommented:
oops missed that one. :-)

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techquesAuthor Commented:
Hi

I edited the code and try again. It has an exception: -            
$exception      {"Failure sending mail."}      System.Exception {System.Net.Mail.SmtpException}

I use VC# to develop that windows service program.
What's wrong with it?

using System.Net.Mail;
public void SendMailNow(string from, string to, string title, string content)
        {
            SmtpClient smtp = new SmtpClient(Host);
            if (IsUserCredentials)
            {
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = Credential;
            }
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            MailMessage msg = new MailMessage(from, to, title, content);
            msg.IsBodyHtml = true;
            msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
            msg.BodyEncoding = Encoding.GetEncoding(950); //936 - simplified chinese
            msg.SubjectEncoding = Encoding.GetEncoding(950); //950 - traditional chinese
            smtp.Send(msg);
        }
 
public const string SmtpClientHostFrom = "a@test.com";
public const string SmtpClientHost = "smtp.test.com";
public const string SmtpClientIsUserCredentials = "true";
public const string SmtpClientIsOnlyForLocUser = "false";
public const string SmtpClientCredentialAccount = "admin@test.com";
public const string SmtpClientCredentialPassword = "1234";

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Éric MoreauSenior .Net ConsultantCommented:
is your smtp server is really at "smtp.test.com" ?
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techquesAuthor Commented:
no, it is an example.

i use smtp server in outlook with username and password

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Éric MoreauSenior .Net ConsultantCommented:
it is really hard to figure it out without the exact exception. have a look at http://www.systemnetmail.com/
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techquesAuthor Commented:
Hi

I read http://www.systemnetmail.com/allfaq.aspx and edited the code, it has the same error: Failure to send email.  

How can I fix it now?

public void SendMail(string to, string title, string content)   
        {   
            MailMessage msg = new MailMessage();   
            msg.From = new MailAddress("me@mycompany.com","My Company Name");   
            msg.To.Add(to);   
            msg.Subject = title;   
            msg.Body = content;   
            msg.IsBodyHtml = true;   
            msg.Priority = MailPriority.Normal;   
            msg.ReplyTo = new MailAddress("me@mycompany.com");   
            msg.Headers.Add("Disposition-Notification-To", "me@mycompany.com");   
            msg.SubjectEncoding = Encoding.GetEncoding(950);   
            msg.BodyEncoding = Encoding.GetEncoding(950);   
            msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;   
            SmtpClient smtp = new SmtpClient(smtp.sample.com);   
            smtp.Credentials = new NetworkCredential("testusr", "testpwd");   
            smtp.Send(msg);   
}   

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Éric MoreauSenior .Net ConsultantCommented:
have a look at "5 Troubleshooting System.Net.Mail" to trace all inner exceptions
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techquesAuthor Commented:
If I use home network to send email, it does not work.

However, if I use my friend's network, it can send email.

Why is that case?
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Éric MoreauSenior .Net ConsultantCommented:
>>If I use home network to send email, it does not work.

Your SMTP server is not set/installed correctly
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