驗證郵箱

string strSmtpServer = "smtp.163.com";//郵箱的SMTP服務器
        string strFrom = "  ###   ";   //寫發送郵件的郵箱
        string strFromPass = "  ###  ";//郵箱的密碼
        string strto = this.TextBox1.Text ;//（輸入郵箱的文本框）
        string strSubject = TextBox2.Text;
        string strBody = CKeditor .Text;//（郵箱的正文內容）
        System.Net.Mail.SmtpClient client = new SmtpClient(strSmtpServer);
        client.UseDefaultCredentials = true;
        client.Credentials = new System.Net.NetworkCredential(strFrom, strFromPass);
        client.DeliveryMethod = SmtpDeliveryMethod.Network;

        System.Net.Mail.MailMessage message = new MailMessage(strFrom, strto, strSubject, strBody);
        message.BodyEncoding = System.Text.Encoding.UTF8;
        message.IsBodyHtml = true;
        client.Send(message);