are you using any add-ins? what about rules on sent items? What type of
email account? What firewall, antivirus and antispam products are installed?

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> I've been using outlook for years but about a month ago, whenever I send
> an email with an attachment, a copy is made and it sits in my outbox. It
> is an email that is not addressed but has the same attachment in it. Any
> suggestions on why this is happening and how to stop creating these extra
> messages?