Problem with sending email from asp.net page

Question

1.00/5 (1 vote)

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hi,

while sending email from asp.net page using gmail smtp the following error occur :-

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

the code i have used for sending email is as follow:

protected void btSubmit_Click(object sender, EventArgs e)
    {
        try
        {

            SmtpClient smtpClient = new SmtpClient();
            MailMessage objMail = new MailMessage();
            //From Address will be assigned from the e-mail specified in the From TextField You can also give the code given below.
            MailAddress objMail_fromaddress = new MailAddress(txtMail.Text);
            MailAddress objMail_toaddress = new MailAddress("mymail@gmail.com");
            objMail.IsBodyHtml = true;
            //Assigning From address to the MailMessage class
            objMail.From = objMail_fromaddress;
            //Assigning To address to the MailMessage class as a collection
            objMail.To.Add(objMail_toaddress);
            objMail.Subject = "Feedback from" + txtName.Text + " to us from Contact us Form";
            objMail.Body = "Message from" + txtName.Text + "as comments:-" + txtComments.Text + "<br><br><br>" + "Address:" + txtAddress.Text + "<br>Mobile no:" + txtTel.Text;
            objMail.Priority = MailPriority.High;
            smtpClient.Host = "smtp.gmail.com";
            smtpClient.Credentials = new  System.Net.NetworkCredential("mymail@gmail.com", "1239807643");
            smtpClient.EnableSsl = true;
            smtpClient.Send(objMail);
            Label1.Visible = true;
            Label1.Text = "your feedback is submitted successfully.";
        }
        catch (Exception ex)
        {

            Label1.Visible = true;
            Label1.Text = "something went wrong!, Please Try Again." + ex.Message;
        }

[edit]Cod block added - OriginalGriff[/edit]

Posted 15-Jan-11 22:36pm

Balwant.mnd

Updated 15-Jan-11 22:42pm

OriginalGriff

v2

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3 solutions

Solution 1

Two possibilities I can see:
1) Your user name and / or password is incorrect in the smtpClient.Credentials line.
2) You are trying to use a secure connection and it is not supported.

Simplest: comment out the line

ss

smtpClient.EnableSsl = true;

And see if the problem goes away.

Posted 15-Jan-11 22:46pm

OriginalGriff

Comments

Balwant.mnd 16-Jan-11 4:58am

no these are correct

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Estys · Accepted Answer · 2011-01-16T00:00:00

Solution 2

Accessing gmail requires

smtpClient.Port = 587

Cheers

Posted 16-Jan-11 0:00am

Estys

Comments

Espen Harlinn 16-Jan-11 7:04am

5+ Nicely spotted - and here is a link:http://office.microsoft.com/en-us/outlook-help/use-outlook-with-google-gmail-HA001148898.aspx

Ashish Tyagi 40 · Accepted Answer · 2011-01-16T05:07:00

you are using default SMTP port

but gmail is working on 587

use

smtpClient.Port = 587

before

smtpClient.Send(objMail);

one more thing

MailAddress objMail_fromaddress = new MailAddress(txtMail.Text); // is wrong it should be your gmail user name.

and

MailAddress objMail_toaddress = new MailAddress("mymail@gmail.com");  // it seems like you are sending mail to yourself

use this code

//MailAddress objMail_fromaddress = new MailAddress(txtMail.Text);
MailAddress objMail_fromaddress = new MailAddress(mymail@gmail.com);
//MailAddress objMail_toaddress = new MailAddress("mymail@gmail.com");
MailAddress objMail_toaddress = new MailAddress(txtMail.Text);

good luck :cool: