Mail Sending Error in asp.net

Question

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Hi all!!

i am trying to send mail through asp.net but it gives me error. i googled it but found answers related to networking and i had no idea what to do. Plz help me out.

it gives me the following error---

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

Here is the code of my .aspx.cs

C#

protected void btnSubmitt_Click(object sender, EventArgs e)
   {
       MailMessage mail = new MailMessage();
       mail.Subject =  "Enquiry From the User Of the WebSite";
       mail.Body = "Dear sir , <br/> Following user has provided a feedback about your website <br/><br/>" + "<b>Name :</b>" + txtName.Text + "<br/><b>Email Id :</b>" + txtEmailId.Text + "<br/><b>Mobile No :</b>" + txtMobileNo.Text + "<br/><b>Feedback:</b>" + txtEnquiry.Text;
     
       mail.From = new System.Net.Mail.MailAddress("arcwebsolutions@gmail.com", "Feedback From Website");
       mail.IsBodyHtml = true;
      
       mail.To.Add("ujjwal.uniyal111@gmail.com");
       
       NetworkCredential cred = new NetworkCredential("arcwebsolutions@gmail.com", "password");
      
       SmtpClient smtp = new SmtpClient("smtp.gmail.com");
       smtp.UseDefaultCredentials = false;
       smtp.EnableSsl = true;
       
       smtp.Credentials = cred;
       smtp.Port = 587;
       
       smtp.Send(mail);
       clear();
   }

Posted 12-Dec-11 1:10am

ujjwal uniyal

Updated 12-Dec-11 9:24am

fjdiewornncalwe

v3

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Comments

Richard Arias Prospero 14-Dec-11 10:33am

Thank you! Helped me a lot. I'm currently using VB instead of C#. But it was easy to convert between them when you know them as well.

2 solutions

Solution 1

Have a look here

http://stackoverflow.com/questions/704636/sending-email-through-gmail-smtp-server-with-c-sharp[^]

The answer regarding password strength may well be your issue.

I suggest you change you password ASAP, since you've just posted it on a public forum!!

Posted 12-Dec-11 1:24am

Dylan Morley

Comments

ujjwal uniyal 12-Dec-11 7:30am

thanks for the advise sir but i posted fake password here.. :)

ujjwal uniyal 12-Dec-11 7:33am

I tried the solution provided by you sir but it didn't worked... :(

Monjurul Habib 12-Dec-11 15:19pm

did you try my code ?? hope it will work.

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Monjurul Habib · Accepted Answer · 2011-12-12T06:48:00

Try using the following code, hope it will work. Change credentials (UserName & Password) and receiver address according to yours.

C#

SmtpClient client = new SmtpClient();
      client.DeliveryMethod = SmtpDeliveryMethod.Network;
      client.EnableSsl = true;
      client.Host = "smtp.gmail.com";
      client.Port = 587;

      // setup Smtp authentication
      System.Net.NetworkCredential credentials =
          new System.Net.NetworkCredential("gmailusername@gmail.com", "gmailpassword");
      client.UseDefaultCredentials = false;
      client.Credentials = credentials;

      MailMessage msg = new MailMessage();
      msg.From = new MailAddress("gmailusername@gmail.com");
      msg.To.Add(new MailAddress("xyz@gmail.com"));
      msg.Subject = "This is a test Email subject";
      msg.IsBodyHtml = true;
      msg.Body = string.Format("<html><head></head><body>Test HTML Email</body>");
      try
      {
          client.Send(msg);
          //lblMsg.Text = "Your message has been successfully sent.";
      }

      catch (Exception ex)
      {
          //lblMsg.ForeColor = Color.Red;
          //lblMsg.Text = "Error occured while sending your message." + ex.Message;

      }

Make sure you have removed all mail settings from your web.config file.

Let me know if there is any issue.