SMTP不在gmail商業帳戶中發送電子郵件

Question

此代碼在gmail個人帳戶中運行良好，但是當我嘗試使用gmail商業帳戶時，它不工作並且一直給出錯誤。 5.5.1需要驗證。

void SendEmail() 
{ 
    DataTable data = GetData(); 
    DataTable email_data = GetEmailData(); 
    data.TableName = "Employee_Data"; 

    using (XLWorkbook wb = new XLWorkbook()) 
    { 
     wb.Worksheets.Add(data); 

     using (MemoryStream memoryStream = new MemoryStream()) 
     { 
      wb.SaveAs(memoryStream); 
      byte[] bytes = memoryStream.ToArray(); 
      memoryStream.Close(); 
      String from = "seong@abcd.net"; 

      for (int i = 0; i < email_data.Rows.Count; i++) 
      { 
       String to = email_data.Rows[i][0].ToString(); 

       using (MailMessage mm = new MailMessage(from, to)) 
       { 
        mm.Subject = "Employees Attachment"; 
        mm.Body = "Employees Exported Attachment"; 

        mm.Attachments.Add(new Attachment(new MemoryStream(bytes), "Employees.xlsx")); 
        mm.IsBodyHtml = true; 
        SmtpClient smtp = new SmtpClient(); 
        smtp.Host = "smtp.gmail.com"; 
        smtp.EnableSsl = true; 
        System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(); 
        credentials.UserName = "seong@abcd.net"; 
        credentials.Password = "1234"; 
        smtp.UseDefaultCredentials = true; 
        smtp.Credentials = credentials; 
        smtp.Port = 587; 
        smtp.Send(mm); 
       } 
      } 
     } 
    } 
} 

Answer 1

我解決了這個問題。 如果您想使用SMTP，該帳戶不應該在Gmail中使用第二次驗證。

https://support.google.com/accounts/answer/1064203?hl=en&ref_topic=7189195

我無法控制這些事情，我問管理員允許不使用第二驗證。 所以我可以使用SMTP使用該帳戶。