c# - Exchange Web Service API 和 401 未经授权的异常

Question

以下 EWS 调用偶尔会产生 401 错误（每 1000 封电子邮件中有 1 封）已处理。

emailMessage.Load(propertySet);

emailMessage.Move(WellKnownFolderName.DeletedItems);

关于问题是什么的任何想法？电子邮件驻留在收件箱中，并受到许多规则扫描（由于驻留在收件箱中），但规则不会将它们从收件箱中删除。稍后重新处理同一电子邮件将成功。凭据或仅具有静态引用的 propertySet 没有问题。就好像 emailMessage 虽然是从 service.FindItems() 检索到的，但具有临时权限。我在 EWS 日志中没有看到任何相应的错误。

为了澄清，应用于收件箱的规则正在移动其他电子邮件。严格来说，我不知道 ES（+message labs）在将电子邮件放入收件箱之前是否应用了规则（例如跨度检查等）。如果在插入后应用，我可以理解可能有 2 个进程针对收件箱工作，可能同时进行。如果是这样，我不知道可能会产生什么影响。这都是猜测 - 我不知道这是否与我的问题有关。但是，异常表明 401 来自 EWS 响应，即使我在 EWS 日志中没有找到相同的内容。

Error: Microsoft.Exchange.WebServices.Data.ServiceRequestException: The request failed. The remote server returned an error: (401) Unauthorized. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.
   at System.Net.HttpWebRequest.GetResponse()
   at Microsoft.Exchange.WebServices.Data.EwsHttpWebRequest.Microsoft.Exchange.WebServices.Data.IEwsHttpWebRequest.GetResponse()
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
   --- End of inner exception stack trace ---
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request)
   at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
   at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalLoadPropertiesForItems(IEnumerable`1 items, PropertySet propertySet, ServiceErrorHandling errorHandling)
   at Microsoft.Exchange.WebServices.Data.Item.InternalLoad(PropertySet propertySet)

Microsoft.Exchange.WebServices.Data.ServiceRequestException: The request failed. The remote server returned an error: (401) Unauthorized. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.
   at System.Net.HttpWebRequest.GetResponse()
   at Microsoft.Exchange.WebServices.Data.EwsHttpWebRequest.Microsoft.Exchange.WebServices.Data.IEwsHttpWebRequest.GetResponse()
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
   --- End of inner exception stack trace ---
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
   at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request)
   at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
   at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalMoveItems(IEnumerable`1 itemIds, FolderId destinationFolderId, Nullable`1 returnNewItemIds, ServiceErrorHandling errorHandling)
   at Microsoft.Exchange.WebServices.Data.ExchangeService.MoveItem(ItemId itemId, FolderId destinationFolderId)
   at Microsoft.Exchange.WebServices.Data.Item.Move(FolderId destinationFolderId)
   at Microsoft.Exchange.WebServices.Data.Item.Move(WellKnownFolderName destinationFolderName)

Answer 1

此问题可能导致 Microsoft Office 365 提供的两步验证。最好创建应用密码并传递该密码，而不是 Outlook 密码。

exchangeService.Credentials = new WebCredentials("email", "app-pwd");