邮件项发件人的SMTP地址

Question

我为Outlook 2016创建了一个插件。

要获取发件人的SMTP地址，我正在关注How to: Get the SMTP Address of the Sender of a Mail Item

最近在尝试下线

时开始破坏

if (sender.AddressEntryUserType == Outlook.OlAddressEntryUserType.olExchangeUserAddressEntry
    || sender.AddressEntryUserType == Outlook.OlAddressEntryUserType.olExchangeRemoteUserAddressEntry)

  

消息=＆＃34;操作失败。＆＃34; StackTrace =＆＃34; at Microsoft.Office.Interop.Outlook.AddressEntry.get_AddressEntryUserType（）\ r \ n at .....＆＃34;   ErrorCode = -1802485755