Note that ScreenCastsOnline is a membership based service, but you can also see the tutorial as part of a free trial period. See more on the preview page.
Alternatively, there is a ScreenCastsOnline monthly magazine available on the iTunes App Store. This also includes a free trial period, allowing you to download this month’s issue, including the MailMate video tutorial. If you like, you can cancel the free trial after downloading this months issue.