I want to send mail through coding , But in the code i have to write the SMTP server name , but I don't have the SMTP mail server .
Can I send mail without installing SMTP mail server or by Configuring the IIS on my PC , If yes then what should I have to write in the place of "SMTP server name" . 
Is their any site from where can i get the SMTP server (full version) for free .

Hi Ravi,
You can download SMTP server for free of cost from below sites. It will act as a local SMTP servers.
http://www.qksoft.com/qk-smtp-server/
http://www.topshareware.com/free-smtp-server/downloads/1.htm
http://www.bestsoftware4download.com/software/t-free-free-smtp-server-download-tfelcnhw.html
See http://www.eggheadcafe.com/articles/20030316.asp article which has complete code to send mails without using SMTP server or CDO.
You can also send emails without using SMTP server but using DNS lookups. See below code which sends a mails to the recepients which are not in same domain. Ofcourse there are some limitations, see  http://www.emailarchitect.net/WebApp/SMTPCOM/developers/dnslookup.asp for details.
You can also use CDO objects or MAPI sessions concept to send the email which dont required SMTP server.
private void SendEmail()
{
  AOSMTPLib.MailClass oSmtp = new AOSMTPLib.MailClass();
  oSmtp.FromAddr = "test@emailarchitect.net";
  oSmtp.Subject = "Test";
  oSmtp.BodyText = "Hello, this is a test....";
  
  string[] recipients = new string[2];
  recipients[0] = "support@adminsystem.net";
  recipients[1] = "test@hotmail.com";
  
  for( int i = 0; i < recipients.Length; i++ )
  {
    oSmtp.ClearRecipient();
    oSmtp.AddRecipient( recipients[i], recipients[i], 0 );
    oSmtp.ServerAddr = "";     
    if( oSmtp.SendMail() == 0 )
      Console.WriteLine( "Message to {0} delivered!", recipients[i] );
    else
      Console.WriteLine( "Message to {0} failed: {1}", 
                        recipients[i], 
                        oSmtp.GetLastErrDescription());
  }
}
-Jack

Hi,



You NEED an SMTP server to send email regardless of the
programming/scripting language. The Send Mail Transport Protocol is the
standard used for sending email across the internet.

For .NET, most hosts (if your doing web applications) have that already
installed, but if your doing a normal application, then you have an SMTP server to send the email. Usually, programmers supply an option
in the program so the user can change the SMTP information so that the
program could work. I usually allow the user add his email SMTP
information into the settings of the program so that he/she could use
the email features.

You can send e-mails without SMTP. For more info look at this
http://www.eggheadcafe.com/articles/20030316.asp

You can use algorithm of DNS lookup in ANSMTP which enables your application 
						to send email without SMTP server.

							
How to send email with DNS lookup;

							
How to send email to multiple recipients who don't belong to the same domain.
					
				
Installation and Deployment 
	
				

				You should download the ansmtp installer
				and install it on your machine at first.
					
					

						How does it work?
					
					
					

						In general, we send email via specified SMTP server. How does the specified 
						SMTP server know what address this email should be sent to? It queries MX 
						record of recipient's domain via DNS lookup. Then it forwards this email to the 
						SMTP server queried from DNS server. If the recipient's server doesn't work 
						fine, your SMTP server will send an email to tell the sender there is failure 
						in sending this email.
					
					
					

						How does ANSMTP work with DNS lookup? ANSMTP queries DNS directly from DNS, 
						then send email to recipient's email server. If it fail, SendMail method will 
						fail in synchronous mode and OnError event will occur (instead of sending an 
						email to tell sender) in asynchronous mode, and your application can do 
						something for this failure. If it fail in sending email via DNS lookup, it will 
						also fail in sending email with specified SMTP server.
					
					
Send email without specified SMTP server
					

						We just need to assign "" to ServerAddr property of ANSMTP, ANSMTP would send 
						email via automatically.
					
					
C# Example
private void SendEmail()
{
  AOSMTPLib.MailClass oSmtp = new AOSMTPLib.MailClass();
  //If you don't have a SMTP server, use the following code
  //send email via DNS lookup, ANSMTP lookups SMTP server automatically.
  oSmtp.ServerAddr = "";  
  
  oSmtp.FromAddr = "test@adminsystem.net";
  oSmtp.AddRecipient( "Support Team", "support@adminsystem.net", 0 );

  oSmtp.Subject = "Test";
  oSmtp.BodyText = "Hello, this is a test....";
  
  if( oSmtp.SendMail() == 0 )
    Console.WriteLine( "Message delivered!" );
  else
    Console.WriteLine( oSmtp.GetLastErrDescription());
}

					
Limitations with DNS lookup
					

						If you specified multiple recipients,  make sure all recipients' email 
						addresses belong to the same domain, otherwise "Error with sending recipient" 
						occurs.
					
					
C# Example
private void SendEmail()
{
  AOSMTPLib.MailClass oSmtp = new AOSMTPLib.MailClass();
  //If you don't have a SMTP server, use the following code
  //send email via DNS lookup, ANSMTP lookups SMTP server automatically.
  oSmtp.ServerAddr = "";  
  
  oSmtp.FromAddr = "test@emailarchitect.net";
  //Correct, both support@adminsystem.net and test@adminsystem.net
  //belong to adminsystem.net
  oSmtp.AddRecipient( "Support Team", "support@adminsystem.net", 0 );
  oSmtp.AddRecipient( "Tester", "test@adminsystem.net", 1 ); 
  
 
  oSmtp.Subject = "Test";
  oSmtp.BodyText = "Hello, this is a test....";
  
  if( oSmtp.SendMail() == 0 )
    Console.WriteLine( "Message delivered!" );
  else
    Console.WriteLine( oSmtp.GetLastErrDescription());
}

					
The code below shows how to send email to multiple recipients who don't belong 
						to the same domain.
					
C# Example
private void SendEmail()
{
  AOSMTPLib.MailClass oSmtp = new AOSMTPLib.MailClass();
  oSmtp.FromAddr = "test@emailarchitect.net";
  oSmtp.Subject = "Test";
  oSmtp.BodyText = "Hello, this is a test....";
  
  string[] recipients = new string[2];
  recipients[0] = "support@adminsystem.net";
  recipients[1] = "test@hotmail.com";
  
  for( int i = 0; i < recipients.Length; i++ )
  {
    oSmtp.ClearRecipient();
    oSmtp.AddRecipient( recipients[i], recipients[i], 0 );
    oSmtp.ServerAddr = "";     
    if( oSmtp.SendMail() == 0 )
      Console.WriteLine( "Message to {0} delivered!", recipients[i] );
    else
      Console.WriteLine( "Message to {0} failed: {1}", 
                        recipients[i], 
                        oSmtp.GetLastErrDescription());
  }
}

IMO, the best way of sending low volume mails programmatically is to use GMail rather than expend resources setting up & maintaining your own mail server. 

Adapt this snippet -

System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();

System.Net.NetworkCredential cred = new System.Net.NetworkCredential("yourid@gmail.com", "yourpwd");

mail.To.Add("acme@acme.com");
mail.Subject = "subject";

mail.From = new System.Net.Mail.MailAddress("yourid@gmail.com");
mail.IsBodyHtml = true;
mail.Body = "message";

System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com");
smtp.UseDefaultCredentials = false;
smtp.EnableSsl = true;
smtp.Credentials = cred;
smtp.Port = 587;
smtp.Send(mail);

Source: http://mvark.blogspot.com/2006/09/sending-mail-programmatically-using-c.html

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