EWS SearchFilter.ContainsSubstring to filter on Sender Email Address
I'm trying to filter emails on Exchange Web Services using SearchFilter.ContainsSubstring as follows: sfilter = New SearchFilter.ContainsSubstring(EmailMessageSchema.Sender, EmailAddress, ContainmentMode.Substring, ComparisonMode.IgnoreCase) MailItems = service.FindItems(Folder.Id, sfilter, view) Unfortunately this doesn't work, and I don't want to use Queries, because I can't guarantee that I can use features of Exchange Server 2013. Composing a variety of requests in Fiddler, I can observe that if I remove the last character of the email address, then the filter works, remove the first