I dont think you will be able to compress that enough.
*Try drop box or another FTP based file sharing system.
*If you yourself have an FTP you can zip it and place it on your FTP and send the link via email. They will then get prompted if they want to download the file when they click the link.
Otherwise you will need to change the codec to qt h.264 but that will change the quality…. depending what you are using now.
Maybe someone else can offer a better answer.
/Randy