How to send mail with SMTP authentication in .net C sharp

using System.Net;
using System.Net.Mail;

SmtpClient smtpClient = new SmtpClient();

NetworkCredential basicCredential = new NetworkCredential(username, password); 

MailMessage message = new MailMessage(); 

MailAddress fromAddress = new MailAddress(from@yourdomain-name.com); 

smtpClient.Host = your domain-name;

smtp.Port = 25;

smtp.EnableSsl = false; 

smtpClient.UseDefaultCredentials = false;

smtpClient.Credentials = basicCredential;

message.From = fromAddress;
message.Subject = your subject;
//Set IsBodyHtml to true means you can send HTML email.
message.IsBodyHtml = true;
message.Body = your message body;
message.To.Add(to@anydomain.com); 

try
{
 smtpClient.Send(message);
}
catch(Exception ex)
{
 //Error, could not send the message
 Response.Write(ex.Message);
}

Note :

User name and password is your domain email address and password


For gmail based SMTP authentication :

NetworkCredential basicCredential = new NetworkCredential(yourmail@gmail.com, password); 

MailMessage message = new MailMessage(); 

MailAddress fromAddress = new MailAddress(from@gmail.com); 

smtpClient.Host = smtp.gmail.com;

smtp.Port = 587;

smtp.EnableSsl = true;



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