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

Posted on 2008-10-03
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Last Modified: 2013-12-17
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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Question by:techques
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12 Comments
 
LVL 20

Expert Comment

by:REA_ANDREW
ID: 22632309
You are trying to assign a string to an enum

replace

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

with

msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
0
 
LVL 71

Expert Comment

by:Éric Moreau
ID: 22632446
this line:
msg.ReplyTo = to;

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

And REA_ANDREW already replied for the DeliveryNotificationOptions
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Expert Comment

by:REA_ANDREW
ID: 22632459
oops missed that one. :-)

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Author Comment

by:techques
ID: 22634557
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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LVL 71

Expert Comment

by:Éric Moreau
ID: 22634670
is your smtp server is really at "smtp.test.com" ?
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Author Comment

by:techques
ID: 22634687
no, it is an example.

i use smtp server in outlook with username and password

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LVL 71

Expert Comment

by:Éric Moreau
ID: 22635051
it is really hard to figure it out without the exact exception. have a look at http://www.systemnetmail.com/
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Author Comment

by:techques
ID: 22645073
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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LVL 71

Expert Comment

by:Éric Moreau
ID: 22645228
have a look at "5 Troubleshooting System.Net.Mail" to trace all inner exceptions
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Author Comment

by:techques
ID: 22647381
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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LVL 20

Accepted Solution

by:
REA_ANDREW earned 375 total points
ID: 22647843
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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LVL 71

Expert Comment

by:Éric Moreau
ID: 22648423
>>If I use home network to send email, it does not work.

Your SMTP server is not set/installed correctly
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