h2>
 發送電子郵件演示
 /h2>
 table cellpadding="0" cellspacing="0" border="0" style="font-family: 宋體, Arial, Helvetica, sans-serif;
 font-size: 15px; width: 411px;">
 tr>
 td class="style5">
 郵箱地址：
 /td>
 td class="style6">
 asp:TextBox ID="tb_Email" runat="server" Width="269px">/asp:TextBox>
 /td>
 /tr>
 tr>
 td class="style5">
 抄送至：
 /td>
 td class="style6">
 asp:TextBox ID="tb_cc" runat="server" Width="268px">/asp:TextBox>
 /td>
 /tr>
 tr>
 td class="style5">
 郵件主題：
 /td>
 td class="style6">
 asp:TextBox ID="tb_Subject" runat="server" Width="268px">/asp:TextBox>
 /td>
 /tr>
 tr>
 td class="style5">
 郵件內容：
 /td>
 td class="style6">
 asp:TextBox ID="tb_Body" runat="server" Height="63px" TextMode="MultiLine" Width="266px">/asp:TextBox>
 /td>
 /tr>
 tr>
 td class="style5">
 添加附件：
 /td>
 td class="style6">
 asp:FileUpload ID="tb_Attachment" runat="server" Width="265px" />
 /td>
 /tr>
 tr>
 td align="right" colspan="2">
 asp:Button ID="btn_SendEmail" runat="server" Text="發送郵件" OnClick="btn_SendEmail_Click" />
 /td>
 /tr>
 /table>

protected void btn_SendEmail_Click(object sender, EventArgs e)
 {
 //聲明一個Mail對象
 MailMessage mymail = new MailMessage();
 //發件人地址
 //如是自己，在此輸入自己的郵箱
 mymail.From = new MailAddress("15510180880@163.com");
 //收件人地址
 mymail.To.Add(new MailAddress(tb_Email.Text));
 //郵件主題
 mymail.Subject = tb_Subject.Text;
 //郵件標題編碼
 mymail.SubjectEncoding = System.Text.Encoding.UTF8;
 //發送郵件的內容
 mymail.Body = tb_Body.Text;
 //郵件內容編碼
 mymail.BodyEncoding = System.Text.Encoding.UTF8;
 //添加附件
 Attachment myfiles = new Attachment(tb_Attachment.PostedFile.FileName);
 mymail.Attachments.Add(myfiles);
 //抄送到其他郵箱
 mymail.CC.Add(new MailAddress(tb_cc.Text));
 //是否是HTML郵件
 mymail.IsBodyHtml = true;
 //郵件優先級
 mymail.Priority = MailPriority.High;
 //創建一個郵件服務器類
 SmtpClient myclient = new SmtpClient();
 myclient.Host = "SMTP.163.com"; 
 //SMTP服務端口
 myclient.Port = 25;
 //驗證登錄
 myclient.Credentials = new NetworkCredential("@@@@@@", "*****");//"@"輸入有效的郵件名, "*"輸入有效的密碼
 myclient.Send(mymail);
 }