Ive been looking into this more recently and have the following:
I am running a Console application which will set up a streaming connection to check for new emails arriving in the mailbox for [email protected]
static void Main(string[] args)
{
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013);
WebCredentials wbcred = new WebCredentials("userone", "password", "mydomain");
service.Credentials = wbcred;
Console.WriteLine("Attempting to autodiscover Url...");
service.AutodiscoverUrl("[email protected]", RedirectionUrlValidationCallback);
EWSConnection.SetStreamingNotifications(service);
Console.ReadKey();
Environment.Exit(0);
}
My EWSConnection static class looks loosely like this:
public static void SetStreamingNotifications(ExchangeService service)
{
_service = service;
try
{ var subscription = service.SubscribeToStreamingNotifications(
new FolderId[] { WellKnownFolderName.Inbox },
EventType.NewMail);
StreamingSubscriptionConnection connection = new StreamingSubscriptionConnection(service, 5);
connection.AddSubscription(subscription);
connection.OnNotificationEvent += new StreamingSubscriptionConnection.NotificationEventDelegate(OnEvent);
connection.Open();
_subscription = subscription;
_subscriptionConnection = connection;
Console.WriteLine($"Connection Open:{connection.IsOpen}");
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
With this, you can see I have subscribed to the OnNotificationEvent and in turn my OnEvent method will be invoked when a new email arrives. When a new email arrives to this mailbox I have a requirement to create a task and assign it to the relevant person, based on what the ToAddress property is.
private static void CreateTask(NotificationEvent notification, RecievedMail recievedMail)
{
try
{
Console.WriteLine("Attempting to create task");
Microsoft.Exchange.WebServices.Data.Task task = new Microsoft.Exchange.WebServices.Data.Task(_service);
task.DueDate = DateTime.Now.AddDays(7);
task.Body = recievedMail.Body;
task.Subject = recievedMail.Subject;
string targetSharedEmailAddress = null;
if (recievedMail.ToAddress.ToString() == "humanresources <SMTP:[email protected]>")
{
targetSharedEmailAddress = "[email protected]";
}
task.Save(new FolderId(WellKnownFolderName.Tasks,targetSharedEmailAddress)); //
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
At first you can see that I tried adding the person that I wanted the task to be created for in the task.Save method, however once I went to Outlook to interact with the newly created task, the owner was still userone, i.e. the person who's credentials were used to connect to the service, this was an issue for me as I need the task owner to be usertwo.
This was accomplished by dropping the targetSharedEmailAddress variable and instead using the ImpersonatedUserId property of the ExchangeServer object.
if (recievedMail.ToAddress.ToString() == "humanresources <SMTP:[email protected]>")
{
_service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "[email protected]");
}
https://msdn.microsoft.com/en-us/library/office/dd633680(v=exchg.80).aspx
