Hi there,
You can publish as swf and send the published output or publish as pdf and send it. It will not require Captivate. It just needs Flash to be installed and today everyone has flash installed. Make sure you send the entire folder after publishing as SWF. And if you are publishing as PDF just send the PDF file.
You can also publish as .exe for windows and. app for mac but it will not transfer through email as email policy does not allow transfer of executables. In that case you can share it through DropBox or Google drive like sharing services.
Thanks!