您可以使用.NET框架的 System.Net.Mail.MailMessage 类。
您可以在此处找到MSDN文档。
这是一个简单的示例（代码段）：
using System.Net;using System.Net.Mail;using System.Net.Mime;...try{ SmtpClient mySmtpClient = new SmtpClient("my.smtp.exampleserver.net"); // 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@example.com", "TestFromName"); MailAddress to = new MailAddress("test2@example.com", "TestToName"); MailMessage myMail = new System.Net.Mail.MailMessage(from, to); // add ReplyTo MailAddress replyTo = new MailAddress("reply@example.com"); myMail.ReplyToList.Add(replyTo); // set subject and encoding myMail.Subject = "Test message"; myMail.SubjectEncoding = System.Text.Encoding.UTF8; // set body-message and encoding myMail.Body = "<b>Test Mail</b><br>using <b>HTML</b>."; myMail.BodyEncoding = System.Text.Encoding.UTF8; // text or html myMail.IsBodyHtml = true; mySmtpClient.Send(myMail);}catch (SmtpException ex){ throw new ApplicationException ("SmtpException has occured: " + ex.Message);}catch (Exception ex){ throw ex;}
