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My code:

private void button1_Click(object sender, EventArgs e)

                MailMessage mail = new MailMessage();
                mail.From = new MailAddress("");
                mail.Subject = "School Name";
                string Body = txtmsg.Text;
                mail.IsBodyHtml = true;

                SmtpClient smtp = new SmtpClient("localhost", 25);
                smtp.Host = ""; //Or Your SMTP Server Address  
                smtp.Credentials = new System.Net.NetworkCredential
                     ("", "rima001");
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.EnableSsl = true;
                MessageBox.Show("Mail Send");
            catch (Exception ex)

My App.Config :

<?xml version="1.0" encoding="utf-8" ?>

      <smtp deliveryMethod="PickupDirectoryFromIis">
        <network defaultCredentials="true" host="localhost" port="25"/>

Error: Failure sending mail

Can anybody tell me where is the problem for sending mail in windows application ? Please help me.
Posted 30-Jun-12 0:52am
barneyman 30-Jun-12 6:18am
i do hope you haven't just handed the world your gmail password! I'd change it pretty quick
Dhinesh kumar.V 31-Oct-12 2:59am
Hi All,

Is there any possibility for send mail from any other ID like yahoo,hotmail.. I had done for gmail for long ago but dont know for other id... all replies welcome..
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Solution 1

Gmail's send port is 587 not 25.
UL UL ALBAB 30-Jun-12 6:22am
Thank You. This is working...
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Solution 2


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