Feature Request - have option for sending without saving to sent items

Would be nice if there was support as an option (config or otherwise) to be able to send an email without saving the email to the user's sent items.

(Maybe in config/office365mail.php).

This is supported by the graph api (by sending the saveToSentItems parameter):

https://docs.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http

