With the EWS.EmailMessage, I can use: myMessage.SendAndSaveCopy and the mail will be sent and a copy with be stored in my Office365 “Sent items” folder.
Is it possible to send and save the GemBox mailmessage (to Sent items folder) using ExchangeClient (EWS)?
Note that this is a hidden pre-released version, to install it you’ll need to run the above command on the NuGet Package Manager Console (Tools → NuGet Package Manager → Package Manager Console).