How do I package and email a file in InDesign CS6?
Goto File > Package
Follow the instructions.
The package will be saved as a folder (eg. on your Desktop).
Zip/compress this folder and attach this zip-file to your e-mail.
What if the person to receive the file has an earlier version of iNdESIGN AND cannot open the file i.e. In¨Design CS3?
Anyone on something that old is going to need to upgrade for this to work.