我試圖檢測我的應(yīng)用程序發(fā)送的電子郵件是否發(fā)送失敗。這意味著我不是要驗證電子郵件，而實際上只是驗證它是否到達了目標(biāo)郵箱。這是我正在使用的 .Net Framework 應(yīng)用程序代碼：    public void Send(EmailRequest emailRequest)    {        // Creates the message itselft        EmailMessage message = new EmailMessage(ServiceExchange);        message.Body = new MessageBody(emailRequest.Message);        message.Subject = emailRequest.Subject;        message.ToRecipients.Add(emailRequest.To);        // Create a custom extended property and add it to the message.         Guid myPropertySetId = Guid.NewGuid();        ExtendedPropertyDefinition myExtendedPropertyDefinition = new ExtendedPropertyDefinition(myPropertySetId, "MyExtendedPropertyName", MapiPropertyType.String);        message.SetExtendedProperty(myExtendedPropertyDefinition, "MyExtendedPropertyValue");        // Asynchronously, call        message.SendAndSaveCopy();        // Wait one second (while EWS sends and saves the message).         System.Threading.Thread.Sleep(1000);        // Now, find the saved copy of the message by using the custom extended property.         ItemView view = new ItemView(5);        SearchFilter searchFilter = new SearchFilter.IsEqualTo(myExtendedPropertyDefinition, "MyExtendedPropertyValue");        view.PropertySet = new PropertySet(BasePropertySet.IdOnly, ItemSchema.Subject, myExtendedPropertyDefinition);        FindItemsResults<Item> findResults = ServiceExchange.FindItems(WellKnownFolderName.SentItems, searchFilter, view);        if (findResults == null) throw new Exception("Could not find results - findResults is null");        if (findResults.Items == null) throw new Exception("Could not find results - findResults.Items is null");        if (findResults.Items.Count == 0) throw new Exception("Could not find results - findResults.Items is 0");        if (findResults.Items.Count > 1) throw new Exception("findResults items returned more than one result");        ItemId itemID = null;    }   例如：如果我將其發(fā)送到有效的電子郵件，一切都很好。這里的目標(biāo)是檢測故障，以便我們可以聯(lián)系業(yè)務(wù)并檢查為什么我們存儲了錯誤的電子郵件地址。