how to use smpt server to send main in tell a friend

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Please check the following url,

Send mail using Google Apps
If you are sending email from gmail or google apps than all sent email would be store in the sent items of the gmail.
Hope this may help you...

try this no need to any settings.

            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 );
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