Some Macintosh software uses Apple’s Mail.app for sending emails. Set up Mail.app to allow sending email, even if you don’t normally use it.
Look in the package
In Mac OS X the applications are often ‘packages’: the application itself and all its various support files all bound up together in one special folder, with its own icon.
Ten Times the Fun!
A quick introduction to new features in Mac OS X 10.2, known as Jaguar.