Dear Raymond.
Thank you for your answer.
I am concerned that separate emails which appear to be attached together may be being sent to recipients for whom they were not intended, because when I look back at the email, other completely different emails, for completely different people are accessible underneath.
The other problem is that when I save an email into a different folder it mostly (confusingly not always) puts my name as the recipient. I don't need to know this - I know I moved it!! I need to see the name of the person I originally sent it to. Can I do anything to sort this?
I will investigate the sweep option, but I haven't tried it yet as it sounds like I could lose a lot of emails in one go by misunderstanding something!