It's not a question of which format so much as what resolution and bit rate. For email you will have to destroy the image completely. I'd suggest you upload it to Youtube and make it private so they need a password to see it.
If you absolutely have to email it 640x480 at 15 fps with a bit rate limited to 320 kbps might stay small enough to email a couple of minutes worth.
What software are you going to use to render it out with?
Cheers,
Pete