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DateTime timestart = DateTime.Now;
                Task.Delay(3000).Wait();
                while (DateTime.Now - timestart < TimeSpan.FromSeconds(60) && string.IsNullOrEmpty(otp))
                {
                    using (var client = new Pop3Client())
                    {
                        client.ServerCertificateValidationCallback = (s, c, h, e) => true;
                        if (string.IsNullOrEmpty(proxyemail))
                        {
                            if (listProxyTempMail.Count() > 0)
                            {
                                string proc = listProxyTempMail.GetQueue();
                                if (!string.IsNullOrEmpty(proc)) proxyemail = proc;
                            }
                        }
                        if (!string.IsNullOrEmpty(proxyemail))
                        {
                            proxyemail = trueproxy(proxyemail);
                            string[] prox = proxyemail.Replace(" ", "").Replace("|", ":").Split(':');
                            string proxyUserName = "";
                            string proxyPassword = "";
                            string proxyHost = prox[0];
                            string proxyPort = "";
                            if (!string.IsNullOrEmpty(proxyHost) && prox.Length >= 2)
                            {
                                proxyPort = prox[1];
                                if (prox.Length > 2)
                                {
                                    proxyUserName = prox[2];
                                    proxyPassword = prox[3];
                                    System.Net.NetworkCredential objNetworkCredential = new System.Net.NetworkCredential(proxyUserName, proxyPassword);
                                    MailKit.Net.Proxy.HttpProxyClient objHttpProxyClient = new HttpProxyClient(proxyHost, int.Parse(proxyPort), objNetworkCredential);
                                    client.ProxyClient = objHttpProxyClient;
                                }
                                else
                                {
                                    MailKit.Net.Proxy.HttpProxyClient objHttpProxyClient = new HttpProxyClient(proxyHost, int.Parse(proxyPort));
                                    client.ProxyClient = objHttpProxyClient;
                                }

                            }
                        }
                        client.SslProtocols = SslProtocols.Ssl3 | SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12;
                        client.Connect(host, port, true);
                        //client.AuthenticationMechanisms.Remove("XOAUTH2");
                        client.Authenticate(Email, PasEmail);

                        #region lấy otp from email
                        int count = client.Count;
                        int countmess = count;
                        while (count > 0 && countmess > 0)
                        {
MimeMessage mess = client.GetMessage(countmess - 1);
                            countmess--;
                            if (DateTime.UtcNow - mess.Date.UtcDateTime > TimeSpan.FromMinutes(60))
                            {
                                break;
                            }
                            if (!mess.From.Any(x => x.Name.IsContains("acebook"))) continue;
                            string textinput = mess.TextBody;
                            if (string.IsNullOrEmpty(textinput)) textinput = mess.HtmlBody;
                            textinput = textinput.Replace("\r", "").Replace("\n", "").Replace(Email, "").Replace(": ", ":").Replace(" :", ":").Replace("> ", ">").Replace(" <", "<").Replace("1501092823525282", "");
                            otp = RegexMatch(mess.HtmlBody, ">(\\d{5,8})<").Groups[1].Value;
                            if (string.IsNullOrEmpty(otp))
                                otp = RegexMatch(textinput, "code:(\\d{5,8})").Groups[1].Value;
                            if (string.IsNullOrEmpty(otp))
                                otp = RegexMatch(textinput, "code([^:]+):(\\d{5,8})").Groups[2].Value;
                            if (string.IsNullOrEmpty(otp))
                                otp = RegexMatch(textinput, "(\\d{" + num + "})").Groups[1].Value;
                            if (string.IsNullOrEmpty(otp))
                                otp = RegexMatch(textinput, ">(\\d{" + num + "})<").Groups[1].Value;
                            if (string.IsNullOrEmpty(otp)) otp = RegexMatch(textinput, "confirmcontact[.]php[?]c=(\\d+)").Groups[1].Value;
                            if (string.IsNullOrEmpty(otp))
                            {
                                continue;
                            }
                            if (!string.IsNullOrEmpty(otp)) break;
                        }
                        #endregion
                        client.Disconnect(true);
                    }
                    if (string.IsNullOrEmpty(otp)) Task.Delay(5000).Wait();
                }