If there are some invalid enail address in the email due to which Enate can't process the email then it shoudl be visible to end user in work manager rather then being in Enate monitor.
Status of "Invalid Recipient(s)" should be shown in Work Manager Unprocessed Emails view.
User should be provided an option to ignore these ivalid email and process the email again so it can create a new work item or attach to the existing one.