I'm not sure if you can do this with outlook express, but I know you can do it with outlook.
You have to reference Outlook in tools - references, then in code open an outlook application, create an email, then add an attachment to it. This has to be an independent file, so you will have had to have exported your report before it can be attached.
Look for outlook automation in a decent ( 800 pages + ) book on access and it will probably have an example of automating outlook, even if it isn't exactly this the pattern for creating a contact or a journal item are similar.