error when sending mail

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Hello friends,
I am sending mail on my website.But it is giving very unusual error.Error is '551 This mail server requires authentication before sending mail from a locally hosted domain'. I am using the same function on all websites.I Don't know where the problem is, is it from server.
This is my code.

C#

System.Web.Mail.MailMessage msg = new System.Web.Mail.MailMessage();
        //MailAddress mlAddrFrom = new MailAddress("info@dphinfotech.com");
        //MailAddress mlAddrTo = new MailAddress("info@dphinfotech.com");

        msg.From = "infodelhi@dphinfotech.com";
        msg.To = "infodelhi@dphinfotech.com";

        msg.Body = "<b>Query</b><br /><br /><br />Firstname: " + txtfirstname.Value + "<br /><br /><br />Lastname: " + txtlastname.Value + "<br /><br /><br />PhoneNo.: " + txtphone.Value +
            "<br /><br /><br />EmailAddress: " + txtemail.Value + "<br /><br /><br />Query: " + txtmessage.Value;
        msg.Subject = "Query";

        msg.Fields["http://schemas.microsoft.com/cdo/configuration/smtsperver"] = "mail.real.co.in";
        //msg.Fields["http://schemas.microsoft.com/cdo/configuration/smtpserverport"] = 25;
        //msg.Fields["http://schemas.microsoft.com/cdo/configuration/sendusing"] = 2;
        msg.Fields["http://schemas.microsoft.com/cdo/configuration/smtpauthenticate"] = 1;
        msg.Fields["http://schemas.microsoft.com/cdo/configuration/sendusername"] = "query@real.co.in";
        msg.Fields["http://schemas.microsoft.com/cdo/configuration/sendpassword"] = "Real";
        System.Web.Mail.SmtpMail.SmtpServer = "mail.real.co.in";
        System.Web.Mail.SmtpMail.Send(msg);
        Response.Redirect("~/thank_you/index.html");

Posted 8-Aug-11 18:28pm

pawanvats

Updated 8-Aug-11 18:29pm

walterhevedeich

v2

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Pravinjas · Answer 1 · 2011-08-08T18:29:00

try this code

string subject = "mention subject here";
        try
        {
            
            string emailTo = "email";
            string emailfrom="email";
            string body = "urbody";
            MailMessage objmail = new MailMessage(emailfrom, emailTo, subject,body);
 
 
            SmtpClient smtpclnt = new SmtpClient("smtp.gmail.com", 587);
            smtpclnt.DeliveryMethod = SmtpDeliveryMethod.Network;
 
            smtpclnt.UseDefaultCredentials = true;
            smtpclnt.EnableSsl = true;
            smtpclnt.Credentials = new System.Net.NetworkCredential("username", "password");
            smtpclnt.Send(objmail);
        }
        catch (Exception ex)
        {
           
        }

Abhinav S · Answer 2 · 2011-08-08T18:30:00

Solution 2

You need to be logged into the mail server before you can send this email.
So make sure you are connected, authenticated and logged into this server.

Posted 8-Aug-11 18:30pm

Abhinav S

walterhevedeich · Answer 3 · 2011-08-08T18:48:00

Solution 3

As Abhinav said, you need to be logged to the mail server. Here[^] is an explanation on how to do it.

Posted 8-Aug-11 18:48pm

walterhevedeich

Comments

pawanvats 9-Aug-11 1:27am

i have used this method also , but showing the same error

walterhevedeich 9-Aug-11 1:40am

Have you tried putting the username and password as well? It seems from your code that you did not.

pawanvats 9-Aug-11 1:56am

i have given. and i was giving it in my old code also
like this :-
msg.Fields["http://schemas.microsoft.com/cdo/configuration/sendusername"] = "query@real.co.in";
msg.Fields["http://schemas.microsoft.com/cdo/configuration/sendpassword"] = "Real";