MailItem.ReceivedOnBehalfOfEntryID Property (Outlook)
Returns a String representing the EntryID of the user delegated to represent the recipient for the mail message. Read-only.
This property corresponds to the MAPI property PidTagReceivedRepresentingEntryId.
If you are getting this property in a Microsoft Visual Basic or Microsoft Visual Basic for Applications (VBA) solution, owing to some type issues, instead of directly referencing ReceivedOnBehalfOfEntryID, you should get the property through the PropertyAccessor object returned by the MailItem.PropertyAccessor property, specifying the MAPI property PidTagReceivedRepresentingEntryId property and its MAPI proptag namespace. The following code sample in VBA shows the workaround.
Public Sub GetReceiverEntryID() Dim objInbox As Outlook.Folder Dim objMail As Outlook.MailItem Dim oPA As Outlook.PropertyAccessor Dim strEntryID As String Const PidTagReceivedRepresentingEntryId As String = "http://schemas.microsoft.com/mapi/proptag/0x00430102" Set objInbox = Application.Session.GetDefaultFolder(olFolderInbox) Set objMail = objInbox.Items(1) Set oPA = objMail.PropertyAccessor strEntryID = oPA.BinaryToString(oPA.GetProperty(PidTagReceivedRepresentingEntryId)) Debug.Print strEntryID Set objInbox = Nothing Set objMail = Nothing End Sub