Unable to send the mailmessage in asp.net

The following code unable to send an emails to customers and it not throwing any exception. The code it not send any email or exception but executed.I am completely new about the asp.net. Some one can help me how to resolve the problem.

Code:

try
{
    String userName = "ramesh";
    String passWord = "123456";
    String sendr = "ramesh@gmail.com";
    String recer = "customer@yahoo.com";
    String subject = "Comformation ";
    String body = "Dear Customer";

    MailMessage msgMail = new MailMessage(sendr, recer, subject, body);

    int PortNumber = 25;
    SmtpClient smtp = new SmtpClient("smtp.test.com", PortNumber);
    msgMail.IsBodyHtml = true;                                     
    smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
    smtp.Credentials = new System.Net.NetworkCredential(userName, passWord);

    smtp.Send(msgMail);

    MsgLP.Text = "Emailed to Customer..";
    LogInLink.Visible = true;
}
catch (Exception ex){
    AuditLog.LogError("ErrorE-mail " + ex.Message);
}

You have to set smtp.EnableSsl=true and use port number 587. Your final code will be this:

try
{
String userName = "ramesh";
String passWord = "123456";
String sendr = "ramesh@gmail.com";
String recer = "customer@yahoo.com";
String subject = "Comformation ";
String body = "Dear Customer";

MailMessage msgMail = new MailMessage(sendr, recer, subject, body);

int PortNumber = 587; //change port number to 587
SmtpClient smtp = new SmtpClient("smtp.gmail.com", PortNumber); //change from test to gmail
smtp.EnableSsl = true; //set EnableSsl to true
msgMail.IsBodyHtml = true;                                     
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Credentials = new System.Net.NetworkCredential(userName, passWord);
smtp.Send(msgMail);
MsgLP.Text = "Emailed to Customer..";
LogInLink.Visible = true;
}
catch (Exception ex){
AuditLog.LogError("ErrorE-mail " + ex.Message);
}

I tested this code with my credentials and it works fine.

 System.Net.Mail.MailMessage mm = new System.Net.Mail.MailMessage();
        mm.From = new MailAddress("email@gmail.com");
        mm.To.Add("email@gmail.com");
        System.Net.Mail.Attachment attachment;
        string strFileName;
        strFileName = "Uploadfile/" + "200814062455PM_Admin_Screenshot (10).JPEG";
        attachment = new System.Net.Mail.Attachment(Server.MapPath(strFileName));
        mm.Attachments.Add(attachment);
        mm.Body = ("<html><head><body><table><tr><td>Hi</td></tr></table></body></html><br/>"); ;

        mm.IsBodyHtml = true;
        mm.Subject = "Candidate " + Name + "  for your Requirement " + Jobtt + " ";
        System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp.gmail.com", 587);
        client.UseDefaultCredentials = false;
        client.Credentials = new System.Net.NetworkCredential("email@gmail.com", "password");
        client.Port = 587;
        client.Host = "smtp.gmail.com";
        client.EnableSsl = true;
        object userstate = mm;
        client.Send(mm);

来源：https://stackoverflow.com/questions/25543233/unable-to-send-the-mailmessage-in-asp-net

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