远程服务器连接失败

Question

我已将邮件地址更改为我的地址，主题以及所有详细信息都将出现，但仍然出错 \

它在我的代码中称为：

 private bool SendEmailOnLeadCreation(
          Users agentuser,
          Users buyeruser,
          ProjectUnitLeads projectUnitLeads)
        {
            string appSetting = ConfigurationManager.AppSettings["WebsiteURL"];
            CommonEmailSettingsModel emailSettings = this._emailManager.GetEmailSettings();
            EmailManager emailManager = new EmailManager(emailSettings);
            List<KeyValuePair<string, string>> mailContent = this._emailManager.GetMailContent("LeadCreation");
            List<string> stringList = new List<string>();
            stringList.Add(buyeruser.UserName);
            string str1 = mailContent.Where<KeyValuePair<string, string>>((Func<KeyValuePair<string, string>, bool>)(x => x.Key == "Subject")).Select<KeyValuePair<string, string>, string>((Func<KeyValuePair<string, string>, string>)(y => y.Value)).FirstOrDefault<string>();
            string str2 = mailContent.Where<KeyValuePair<string, string>>((Func<KeyValuePair<string, string>, bool>)(x => x.Key == "Salutation")).Select<KeyValuePair<string, string>, string>((Func<KeyValuePair<string, string>, string>)(y => y.Value)).FirstOrDefault<string>();
            string str3 = mailContent.Where<KeyValuePair<string, string>>((Func<KeyValuePair<string, string>, bool>)(x => x.Key == "Body")).Select<KeyValuePair<string, string>, string>((Func<KeyValuePair<string, string>, string>)(y => y.Value)).FirstOrDefault<string>().Replace("\r\n", "").Replace("br/", "<br/>").Replace("/b", "<b style='font-size: 15px;'>").Replace("b/", "</b>").Replace("{{Agent_name}}", agentuser == null ? "UBRealty" : "Your agent " + agentuser.FirstName + " " + agentuser.LastName).Replace("{{PropertyOrProject}}", projectUnitLeads.ProjectHeaders != null ? "Project" : "Property").Replace("{{Property_name}}", projectUnitLeads.ProjectHeaders != null ? projectUnitLeads.ProjectHeaders.ProjectTitle : projectUnitLeads.UnitHeaders.PropertyTitle).Replace("{{Property_address}}", projectUnitLeads.ProjectHeaders != null ? projectUnitLeads.ProjectHeaders.Address : projectUnitLeads.UnitHeaders.Address);
            string str4 = ConfigurationManager.AppSettings["AmazonUploadUrl"] + "/CompanyLogo/logo.png";
            string fromEmailAddress = emailSettings.FromEmailAddress;
            string greeting = (str2 ?? "Dear") + " " + buyeruser.FirstName + " " + buyeruser.LastName + ",";
            List<string> toEmail = stringList;
            string subject = str1;
            string content = str3;
            string companylogo = str4;
            emailManager.SendEmail_Sync(fromEmailAddress, greeting, (string)null, toEmail, subject, content, (string)null, (string)null, (List<string>)null, (string)null, (string)null, companylogo);
            return true;
        }



public void SendEmail_Sync(
          string fromEmail,
          string greeting,
          string userComments,
          List<string> toEmail,
          string subject,
          string content,
          string signature,
          string companynameandaddress,
          List<string> attachments,
          string hyperlinktext,
          string hyperlinkurl,
          string companylogo)
        {
            new EmailManager.SendBackgroundMail(this.SendBackgroundMailMethod).BeginInvoke(fromEmail, greeting, userComments, toEmail, subject, content, signature, companynameandaddress, attachments, hyperlinktext, hyperlinkurl, companylogo, (AsyncCallback)null, (object)null);
        }

我想在创建任何用户时将邮件发送到xx @ gmail .com