Sending mail problem

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I am try to send a mail and using this code but a error occurs again and again.it make me confuse please help me my code is

C#

protected void Button1_Click(object sender, EventArgs e)
{
    MailMessage mm = new MailMessage();
    mm.To.Add(txtto.Text);
    mm.From = new MailAddress(txtform.Text);
    mm.Subject = "My Simple mail";
    mm.Body = txtbody.Text;
    mm.IsBodyHtml = false;
    SmtpClient cmt = new SmtpClient();
    cmt.Host = ConfigurationManager.AppSettings["SMTP"];
    cmt.Credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["FROMEMAIL"], ConfigurationManager.AppSettings["FROMPWD"]);
    cmt.DeliveryMethod = SmtpDeliveryMethod.Network;
    cmt.EnableSsl = true;
    cmt.Send(mm);
}

and Web config file::

XML

<appSettings>

    <add key="SMTP" value="smtp.gmail.com"/>

    <add key="FROMEMAIL" value="mail@gmail.com"/>

    <add key="FROMPWD" value="password"/>

  </appSettings>

and when i run the code so This error comes

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

Posted 31-Mar-12 8:40am

faizyab 2009

Updated 31-Mar-12 9:19am

Richard MacCutchan

v2

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CharlieSimon · Answer 1 · 2012-03-31T13:35:00

The code below works for me... I have heard anecdotally that UseDefaulCredentials=false must precees the Credentials line

C#

var smtp = new SmtpClient
{
    Host = "smtp.gmail.com",
    Port = 587,
    EnableSsl = true,
    DeliveryMethod = SmtpDeliveryMethod.Network,
    UseDefaultCredentials = false,
    Credentials = new NetworkCredential(fromAddress.Address, fromPassword),
    Timeout=10000
};
using (var message = new MailMessage(fromAddress, toAddress)
{
    Subject = subject,
    Body = body
})
{
    try
    {
        smtp.Send(message);
     }
    catch (Exception e)
    {
        MessageBox.Show("Email request failed: " + e.Message);
    }
}

Mukund Thakker · Answer 2 · 2012-04-01T19:40:00

Solution 2

Please refer following url,

Send mail using Google Apps[^]

Hope this may help you.

Posted 1-Apr-12 19:40pm

Mukund Thakker

Bojjaiah · Answer 3 · 2012-04-01T20:20:00

try this

MailAddress mailfrom = new MailAddress ( "frommail@gmail.com" );
MailAddress mailto = new MailAddress ( "tomail@gmail.com" );
MailMessage newmsg = new MailMessage ( mailfrom, mailto );
newmsg.Subject = "Subject of Email";
newmsg.Body = "Body(message) of email";
////For File Attachment, more file can also be attached
Attachment att = new Attachment ( "G:\\code.txt" );
newmsg.Attachments.Add ( att );
SmtpClient smtps = new SmtpClient ( "smtp.gmail.com", 587 );
smtps.UseDefaultCredentials = false;
smtps.Credentials = new NetworkCredential ( "urmail@gmail.com", "urpwd" );
smtps.EnableSsl = true;
smtps.Send ( newmsg );

Sending mail problem

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