deedee.brainstream.net 2.0

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

...
try
{

SmtpClient mySmtpClient = new SmtpClient("mein.smtpserver.de");

// set smtp-client with basicAuthentication
mySmtpClient.UseDefaultCredentials = false;
System.Net.NetworkCredential basicAuthenticationInfo = new System.Net.NetworkCredential("username", "password");
mySmtpClient.Credentials = basicAuthenticationInfo;

// add from,to mailaddresses
MailAddress from = new MailAddress("test@error.de", "TestFromName");
MailAddress to = new MailAddress("test2@error.de", "TestToName");
MailMessage myMail = new System.Net.Mail.MailMessage(from, to);

// add cc
MailAddress copy = new MailAddress("test3@error.de");
myMail.CC.Add(copy);

// add bcc
MailAddress bcc = new MailAddress("test4@error.de");
myMail.Bcc.Add(bcc);

// add ReplyTo
MailAddress replyto = new MailAddress("reply@error.de");
myMail.ReplyTo = replyto;

// set Subject and encoding
myMail.Subject = "Testnachricht...";
myMail.SubjectEncoding = System.Text.Encoding.UTF8;

// set body-message and encoding
myMail.Body = "<b>Testmail</b><br>mit HTML und Anhang in 2.0";
myMail.BodyEncoding = System.Text.Encoding.UTF8;
// text or html
myMail.IsBodyHtml = true;

// add attachments (1..n)
Attachment at = new Attachment("C:\\attachment.jpg");
myMail.Attachments.Add(at);

// send normal
mySmtpClient.Send(myMail);
}

catch (SmtpException ex)
{
throw new ApplicationException
("SmtpException has occured: " + ex.Message);
}
catch (Exception ex)
{
throw ex;
}

...