How large is the video file?
Video files are quite large.
Most email servers have a limit of 2 to 10 MB file size.
A few, like Gmail and Hotmail Plus, have a 20 MB limit.
If you want to send a large file, you can't use email.
Some options are:
1. Use a p2p program, like:
ICQ (
http://www.icq.com/download/)
Skype (
http://www.skype.com)
Google Talk (
http://www.google.com/talk/)
2. Use ftp if you have online space somewhere
3. Upload to a file sharing site, like:
http://www.thelinkup.com (was MediaMax)
http://www.yousendit.com
http://www.dropsend.com
http://www.sendthisfile.com